Sending Feedback for Multiple Downlink Carriers

ABSTRACT

Feedback information for multiple serving cells are transmitted on high speed dedicated physical control channel (HS-DPCCH). A slot format for transmitting feedback information is determined based on the number of configured secondary serving cells and whether multiple input multiple-output (MIMO) is configured in the serving cells. Spreading factor is reduced to 128 when two secondary serving cells are configured and MIMO is configured in at least one of the two configured secondary serving cells, or when three secondary serving cells are configured. The serving cells are grouped into feedback groups, each feedback group having one or more serving cells. Channel coding may be applied to feedback information for the feedback groups. The resulting encoded feedback information for the feedback groups is concatenated to form composite feedback information.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.13/026,820 filed Feb. 14, 2011, which claims the benefit of U.S.Provisional Application Ser. No. 61/304,379 filed Feb. 12, 2010, U.S.Provisional Application Ser. No. 61/320,592, filed Apr. 2, 2010, U.S.Provisional Application Ser. No. 61/329,706 filed Apr. 30, 2010, U.S.Provisional Application Ser. No. 61/356,437 filed Jun. 18, 2010, U.S.Provisional Application Ser. No. 61/359,683 filed Jun. 29, 2010, U.S.Provisional Application Ser. No. 61/374,187 filed Aug. 16, 2010, U.S.Provisional Application Ser. No. 61/375,785 Aug. 20, 2010, all of whichare hereby incorporated by reference herein.

BACKGROUND

Simultaneous use of two high speed downlink packet access (HSDPA)downlink carriers was introduced as part of the Release 8 of the thirdgeneration partnership project (3GPP) wireless code division multipleaccess (WCDMA). This feature improves the bandwidth usage via frequencydiversity and resource pooling. As the data usage continues to increaserapidly, high speed packet access (HSPA) deployment is foreseen to bedeployed in more than two downlink carriers. For example, four carrierHSDPA (4C-HSDPA) may allow up to four carriers to operate simultaneouslyto achieve higher downlink throughput.

Feedback information such as positive acknowledgement/negativeacknowledgement (ACK/NACK) information for hybrid automatic repeatrequest (HARQ) and channel quality indication (CQI) information mayindicate the downlink channel conditions. Feedback information may betransmitted to the network over the high speed dedicated physicalcontrol channel (HS-DPCCH) feedback channel in the uplink. However,current technologies may not accommodate sending feedback informationfor multiple carriers such as three or more carriers. Therefore, thereis a need for feedback transmission mechanisms that may allow thenetwork to transmit in more than two carriers simultaneously, allow awireless transmit/receive unit (WTRU) to acknowledge data reception formore than two carriers, and allow multiple the data streams if MIMO isconfigured.

SUMMARY

Systems, methods, and instrumentalities are disclosed that may providefor sending feedback for multiple serving cells/downlink carriers. Theserving cells may include a primary serving cell and one or moresecondary serving cells. Feedback information may be sent via high speeddedicated physical control channel (HS-DPCCH). Feedback information mayinclude hybrid automatic repeat request (HARQ) positiveacknowledgement/negative acknowledgement (ACK/NACK) and channel qualityindication (CQI)/precoding control indication (PCI).

In an embodiment, a slot format for transmitting feedback informationmay be determined based on the number of configured secondary servingcells and whether multiple input multiple-output (MIMO) is configured inthe serving cells. For example, one slot format may use a spreadingfactor of 256, and one slot format may use a spreading factor reducedfrom 256 to 128 for high speed downlink packet access (HSDPA). Forexample, the slot format with spreading factor of 128 may be selectedwhen two secondary serving cells are configured and MIMO is configuredin at least one of the two configured secondary serving cells. Forexample, the slot format with a spreading factor of 128 may be selectedwhen three secondary serving cells are configured.

In an embodiment, the serving cells may be grouped into feedback groups.A feedback group may include one or more serving cells. Channel codingmay be applied to feedback information for the feedback groups. Theresulting encoded feedback information for the feedback groups may beconcatenated to form composite feedback information. The compositefeedback information may be mapped to a physical channel.

For example, HARQ feedback information for the serving cells in afeedback group may be jointly encoded. HARQ feedback information for onefeedback group may be transmitted in a portion of a time slot allocatedfor HARQ feedback transmission. The other portion(s) of the time slotmay be used to transmit HARQ feedback information for other feedbackgroup(s). For example, CQI/PCI feedback information for the servingcells may be encoded individually. The CQI/PCI information for onefeedback group may be transmitted in a time slot allocated for CQIfeedback transmission, and the other time slot(s) in the subframeallocated for CQI/PCI transmission may be used to transmit CQI/PCIinformation for other feedback group(s).

In an embodiment, the serving cells may include a deactivated cell.Feedback information may not be transmitted for the deactivated cell.For example, a discontinuous transmission (DTX) message may be indicatedfor the deactivated cell in a feedback field of a HS-DPCCH subframe. Forexample, feedback information for active cells may be repeated to fillthe whole feedback field in the HS-DPCCH subframe.

In an embodiment, different power offsets may be applied to the feedbackgroups. A power offset for HARQ field and CQI field may be determineddepending on codebooks used. A CQI feedback cycle may be configured on acarrier-specific, carrier group-specific or common basis.

BRIEF DESCRIPTION OF THE DRAWINGS

A more detailed understanding may be had from the following description,given by way of example in conjunction with the accompanying drawingswherein.

FIG. 1A is a system diagram of an example communications system in whichone or more disclosed embodiments may be implemented.

FIG. 1B is a system diagram of an example wireless transmit/receive unit(WTRU) that may be used within the communications system illustrated inFIG. 1A.

FIG. 1C is a system diagram of an example radio access network and anexample core network that may be used within the communications systemillustrated in FIG. 1A.

FIGS. 2A-2D illustrate example HS-DPCCH formats for single and dualcarrier operation.

FIGS. 3-5 illustrate example HS-DPCCH subframe formats.

FIGS. 6 and 7 illustrate example coding flows for feedback reports.

FIGS. 8 and 9 illustrate example HS-DPCCH subframe formats.

FIGS. 10 and 11 illustrate example transmitted signals with PREs/POSTsbeing filled.

FIGS. 12 and 13 illustrate example feedback information transmission.

FIGS. 14-37 illustrate example HS-DPCCH subframe formats.

FIGS. 38-41 illustrate example coding flows of feedback information.

FIG. 42 illustrates a diagram of a prolonged power boost period.

FIG. 43 shows an example carrier specific feedback cycle for one pair ofcarriers.

FIGS. 44-55 illustrate example HS-DPCCH layouts.

FIGS. 56-61 illustrate example transmission of ACK/NACK information onHS-DPCCH over a series of sub-frames.

FIG. 62 shows an example encoding process.

FIG. 63 shows an example encoding process.

FIG. 64 illustrates an example coding scheme.

FIG. 65 illustrates example to HS-DPCCH layout.

FIG. 66 illustrates an example coding scheme.

FIG. 67 illustrates an example coding scheme.

FIG. 68 shows the performance gain of this scheme over repetitioncoding.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

FIG. 1A is a diagram of an example communications system 100 in whichone or more disclosed embodiments may be implemented. The communicationssystem 100 may be a multiple access system that provides content, suchas voice, data, video, messaging, broadcast, etc., to multiple wirelessusers. The communications system 100 may enable multiple wireless usersto access such content through the sharing of system resources,including wireless bandwidth. For example, the communications systems100 may employ one or more channel access methods, such as code divisionmultiple access (CDMA), time division multiple access (TDMA), frequencydivision multiple access (FDMA), orthogonal FDMA (OFDMA), single-carrierFDMA (SC-FDMA), and the like.

As shown in FIG. 1A, the communications system 100 may include wirelesstransmit/receive units (WTRUs) 102 a, 102 b, 102 c, 102 d, a radioaccess network (RAN) 104, a core network 106, a public switchedtelephone network (PSTN) 108, the Internet 110, and other networks 112,though it will be appreciated that the disclosed embodiments contemplateany number of WTRUs, base stations, networks, and/or network elements.Each of the WTRUs 102 a, 102 b, 102 c, 102 d may be any type of deviceconfigured to operate and/or communicate in a wireless environment. Byway of example, the WTRUs 102 a, 102 b, 102 c, 102 d may be configuredto transmit and/or receive wireless signals and may include userequipment (UE), a mobile station, a fixed or mobile subscriber unit, apager, a cellular telephone, a personal digital assistant (PDA), asmartphone, a laptop, a netbook, a personal computer, a wireless sensor,consumer electronics, and the like.

The communications systems 100 may also include a base station 114 a anda base station 114 b. Each of the base stations 114 a, 114 b may be anytype of device configured to wirelessly interface with at least one ofthe WTRUs 102 a, 102 b, 102 c, 102 d to facilitate access to one or morecommunication networks, such as the core network 106, the Internet 110,and/or the networks 112. By way of example, the base stations 114 a, 114b may be a base transceiver station (BTS), a Node-B, an eNode B, a HomeNode B, a Home eNode B, a site controller, an access point (AP), awireless router, and the like. While the base stations 114 a, 114 b areeach depicted as a single element, it will be appreciated that the basestations 114 a, 114 b may include any number of interconnected basestations and/or network elements.

The base station 114 a may be part of the RAN 104, which may alsoinclude other base stations and/or network elements (not shown), such asa base station controller (BSC), a radio network controller (RNC), relaynodes, etc. The base station 114 a and/or the base station 114 b may beconfigured to transmit and/or receive wireless signals within aparticular geographic region, which may be referred to as a cell (notshown). The cell may further be divided into cell sectors. For example,the cell associated with the base station 114 a may be divided intothree sectors. Thus, in one embodiment, the base station 114 a mayinclude three transceivers, i.e., one for each sector of the cell. Inanother embodiment, the base station 114 a may employ multiple-inputmultiple output (MIMO) technology and, therefore, may utilize multipletransceivers for each sector of the cell.

The base stations 114 a, 114 b may communicate with one or more of theWTRUs 102 a, 102 b, 102 c, 102 d over an air interface 116, which may beany suitable wireless communication link (e.g., radio frequency (RF),microwave, infrared (IR), ultraviolet (UV), visible light, etc.). Theair interface 116 may be established using any suitable radio accesstechnology (RAT).

More specifically, as noted above, the communications system 100 may bea multiple access system and may employ one or more channel accessschemes, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and the like. Forexample, the base station 114 a in the RAN 104 and the WTRUs 102 a, 102b, 102 c may implement a radio technology such as Universal MobileTelecommunications System (UMTS) Terrestrial Radio Access (UTRA), whichmay establish the air interface 116 using wideband CDMA (WCDMA). WCDMAmay include communication protocols such as High-Speed Packet Access(HSPA) and/or Evolved HSPA (HSPA+). HSPA may include High-Speed DownlinkPacket Access (HSDPA) and/or High-Speed Uplink Packet Access (HSUPA).

In another embodiment, the base station 114 a and the WTRUs 102 a, 102b, 102 c may implement a radio technology such as Evolved UMTSTerrestrial Radio Access (E-UTRA), which may establish the air interface116 using Long Term Evolution (LTE) and/or LTE-Advanced (LTE-A).

In other embodiments, the base station 114 a and the WTRUs 102 a, 102 b,102 c may implement radio technologies such as IEEE 802.16 (i.e.,Worldwide Interoperability for Microwave Access (WiMAX)), CDMA2000,CDMA2000 1x, CDMA2000 EV-DO, Interim Standard 2000 (IS-2000), InterimStandard 95 (IS-95), Interim Standard 856 (IS-856), Global System forMobile communications (GSM), Enhanced Data rates for GSM Evolution(EDGE), GSM EDGE (GERAN), and the like.

The base station 114 b in FIG. 1A may be a wireless router, Home Node B,Home eNode B, or access point, for example, and may utilize any suitableRAT for facilitating wireless connectivity in a localized area, such asa place of business, a home, a vehicle, a campus, and the like. In oneembodiment, the base station 114 b and the WTRUs 102 c, 102 d mayimplement a radio technology such as IEEE 802.11 to establish a wirelesslocal area network (WLAN). In another embodiment, the base station 114 band the WTRUs 102 c, 102 d may implement a radio technology such as IEEE802.15 to establish a wireless personal area network (WPAN). In yetanother embodiment, the base station 114 b and the WTRUs 102 c, 102 dmay utilize a cellular-based RAT (e.g., WCDMA, CDMA2000, GSM, LTE,LTE-A, etc.) to establish a picocell or femtocell. As shown in FIG. 1A,the base station 114 b may have a direct connection to the Internet 110.Thus, the base station 114 b may not be required to access the Internet110 via the core network 106.

The RAN 104 may be in communication with the core network 106, which maybe any type of network configured to provide voice, data, applications,and/or voice over internet protocol (VoIP) services to one or more ofthe WTRUs 102 a, 102 b, 102 c, 102 d. For example, the core network 106may provide call control, billing services, mobile location-basedservices, pre-paid calling, Internet connectivity, video distribution,etc., and/or perform high-level security functions, such as userauthentication. Although not shown in FIG. 1A, it will be appreciatedthat the RAN 104 and/or the core network 106 may be in direct orindirect communication with other RANs that employ the same RAT as theRAN 104 or a different RAT. For example, in addition to being connectedto the RAN 104, which may be utilizing an E-UTRA radio technology, thecore network 106 may also be in communication with another RAN (notshown) employing a GSM radio technology.

The core network 106 may also serve as a gateway for the WTRUs 102 a,102 b, 102 c, 102 d to access the PSTN 108, the Internet 110, and/orother networks 112. The PSTN 108 may include circuit-switched telephonenetworks that provide plain old telephone service (POTS). The Internet110 may include a global system of interconnected computer networks anddevices that use common communication protocols, such as thetransmission control protocol (TCP), user datagram protocol (UDP) andthe internet protocol (IP) in the TCP/IP internet protocol suite. Thenetworks 112 may include wired or wireless communications networks ownedand/or operated by other service providers. For example, the networks112 may include another core network connected to one or more RANs,which may employ the same RAT as the RAN 104 or a different RAT.

Some or all of the WTRUs 102 a, 102 b, 102 c, 102 d in thecommunications system 100 may include multi-mode capabilities, i.e., theWTRUs 102 a, 102 b, 102 c, 102 d may include multiple transceivers forcommunicating with different wireless networks over different wirelesslinks. For example, the WTRU 102 c shown in FIG. 1A may be configured tocommunicate with the base station 114 a, which may employ acellular-based radio technology, and with the base station 114 b, whichmay employ an IEEE 802 radio technology.

FIG. 1B is a system diagram of an example WTRU 102. As shown in FIG. 1B,the WTRU 102 may include a processor 118, a transceiver 120, atransmit/receive element 122, a speaker/microphone 124, a keypad 126, adisplay/touchpad 128, non-removable memory 106, removable memory 132, apower source 134, a global positioning system (GPS) chipset 136, andother peripherals 138. It will be appreciated that the WTRU 102 mayinclude any sub-combination of the foregoing elements while remainingconsistent with an embodiment.

The processor 118 may be a general purpose processor, a special purposeprocessor, a conventional processor, a digital signal processor (DSP), aplurality of microprocessors, one or more microprocessors in associationwith a DSP core, a controller, a microcontroller, Application SpecificIntegrated Circuits (ASICs), Field Programmable Gate Array (FPGAs)circuits, any other type of integrated circuit (IC), a state machine,and the like. The processor 118 may perform signal coding, dataprocessing, power control, input/output processing, and/or any otherfunctionality that enables the WTRU 102 to operate in a wirelessenvironment. The processor 118 may be coupled to the transceiver 120,which may be coupled to the transmit/receive element 122. While FIG. 1Bdepicts the processor 118 and the transceiver 120 as separatecomponents, it will be appreciated that the processor 118 and thetransceiver 120 may be integrated together in an electronic package orchip.

The transmit/receive element 122 may be configured to transmit signalsto, or receive signals from, a base station (e.g., the base station 114a) over the air interface 116. For example, in one embodiment, thetransmit/receive element 122 may be an antenna configured to transmitand/or receive RF signals. In another embodiment, the transmit/receiveelement 122 may be an emitter/detector configured to transmit and/orreceive IR, UV, or visible light signals, for example. In yet anotherembodiment, the transmit/receive element 122 may be configured totransmit and receive both RF and light signals. It will be appreciatedthat the transmit/receive element 122 may be configured to transmitand/or receive any combination of wireless signals.

In addition, although the transmit/receive element 122 is depicted inFIG. 1B as a single element, the WTRU 102 may include any number oftransmit/receive elements 122. More specifically, the WTRU 102 mayemploy MIMO technology. Thus, in one embodiment, the WTRU 102 mayinclude two or more transmit/receive elements 122 (e.g., multipleantennas) for transmitting and receiving wireless signals over the airinterface 116.

The transceiver 120 may be configured to modulate the signals that areto be transmitted by the transmit/receive element 122 and to demodulatethe signals that are received by the transmit/receive element 122. Asnoted above, the WTRU 102 may have multi-mode capabilities. Thus, thetransceiver 120 may include multiple transceivers for enabling the WTRU102 to communicate via multiple RATs, such as UTRA and IEEE 802.11, forexample.

The processor 118 of the WTRU 102 may be coupled to, and may receiveuser input data from, the speaker/microphone 124, the keypad 126, and/orthe display/touchpad 128 (e.g., a liquid crystal display (LCD) displayunit or organic light-emitting diode (OLED) display unit). The processor118 may also output user data to the speaker/microphone 124, the keypad126, and/or the display/touchpad 128. In addition, the processor 118 mayaccess information from, and store data in, any type of suitable memory,such as the non-removable memory 106 and/or the removable memory 132.The non-removable memory 106 may include random-access memory (RAM),read-only memory (ROM), a hard disk, or any other type of memory storagedevice. The removable memory 132 may include a subscriber identitymodule (SIM) card, a memory stick, a secure digital (SD) memory card,and the like. In other embodiments, the processor 118 may accessinformation from, and store data in, memory that is not physicallylocated on the WTRU 102, such as on a server or a home computer (notshown).

The processor 118 may receive power from the power source 134, and maybe configured to distribute and/or control the power to the othercomponents in the WTRU 102. The power source 134 may be any suitabledevice for powering the WTRU 102. For example, the power source 134 mayinclude one or more dry cell batteries (e.g., nickel-cadmium (NiCd),nickel-zinc (NiZn), nickel metal hydride (NiMH), lithium-ion (Li-ion),etc.), solar cells, fuel cells, and the like.

The processor 118 may also be coupled to the GPS chipset 136, which maybe configured to provide location information (e.g., longitude andlatitude) regarding the current location of the WTRU 102. In additionto, or in lieu of, the information from the GPS chipset 136, the WTRU102 may receive location information over the air interface 116 from abase station (e.g., base stations 114 a, 114 b) and/or determine itslocation based on the timing of the signals being received from two ormore nearby base stations. It will be appreciated that the WTRU 102 mayacquire location information by way of any suitablelocation-determination method while remaining consistent with anembodiment.

The processor 118 may further be coupled to other peripherals 138, whichmay include one or more software and/or hardware modules that provideadditional features, functionality and/or wired or wirelessconnectivity. For example, the peripherals 138 may include anaccelerometer, an e-compass, a satellite transceiver, a digital camera(for photographs or video), a universal serial bus (USB) port, avibration device, a television transceiver, a hands free headset, aBluetooth® module, a frequency modulated (FM) radio unit, a digitalmusic player, a media player, a video game player module, an Internetbrowser, and the like.

FIG. 1C is a system diagram of the RAN 104 and the core network 106according to an embodiment. As noted above, the RAN 104 may employ aUTRA radio technology to communicate with the WTRUs 102 a, 102 b, 102 cover the air interface 116. The RAN 104 may also be in communicationwith the core network 106. As shown in FIG. 1C, the RAN 104 may includeNode-Bs 140 a, 140 b, 140 c, which may each include one or moretransceivers for communicating with the WTRUs 102 a, 102 b, 102 c overthe air interface 116. The Node-Bs 140 a, 140 b, 140 c may each beassociated with a particular cell (not shown) within the RAN 104. TheRAN 104 may also include RNCs 142 a, 142 b. It will be appreciated thatthe RAN 104 may include any number of Node-Bs and RNCs while remainingconsistent with an embodiment.

As shown in FIG. 1C, the Node-Bs 140 a, 140 b may be in communicationwith the RNC 142 a. Additionally, the Node-B 140 c may be incommunication with the RNC 142 b. The Node-Bs 140 a, 140 b, 140 c maycommunicate with the respective RNCs 142 a, 142 b via an Iub interface.The RNCs 142 a, 142 b may be in communication with one another via anIur interface. Each of the RNCs 142 a, 142 b may be configured tocontrol the respective Node-Bs 140 a, 140 b, 140 c to which it isconnected. In addition, each of the RNCs 142 a, 142 b may be configuredto carry out or support other functionality, such as outer loop powercontrol, load control, admission control, packet scheduling, handovercontrol, macrodiversity, security functions, data encryption, and thelike.

The core network 106 shown in FIG. 1C may include a media gateway (MGW)144, a mobile switching center (MSC) 146, a serving GPRS support node(SGSN) 148, and/or a gateway GPRS support node (GGSN) 150. While each ofthe foregoing elements are depicted as part of the core network 106, itwill be appreciated that any one of these elements may be owned and/oroperated by an entity other than the core network operator.

The RNC 142 a in the RAN 104 may be connected to the MSC 146 in the corenetwork 106 via an IuCS interface. The MSC 146 may be connected to theMGW 144. The MSC 146 and the MGW 144 may provide the WTRUs 102 a, 102 b,102 c with access to circuit-switched networks, such as the PSTN 108, tofacilitate communications between the WTRUs 102 a, 102 b, 102 c andtraditional land-line communications devices.

The RNC 142 a in the RAN 104 may also be connected to the SGSN 148 inthe core network 106 via an IuPS interface. The SGSN 148 may beconnected to the GGSN 150. The SGSN 148 and the GGSN 150 may provide theWTRUs 102 a, 102 b, 102 c with access to packet-switched networks, suchas the Internet 110, to facilitate communications between and the WTRUs102 a, 102 b, 102 c and IP-enabled devices.

As noted above, the core network 106 may also be connected to thenetworks 112, which may include other wired or wireless networks thatare owned and/or operated by other service providers.

FIG. 2A illustrates an example HS-DPCCH format for single carrieroperation (SC). As shown, the ACK/NACK codebook size may be 4 that maybe denoted as A/N(4). The HS-DPCCH format may include a CQI table of 5bits encoded by a (20, 5) Reed Muller code that may be denoted asCQI(20,5).

FIG. 2B illustrates an example HS-DPCCH format for single carrieroperation with MIMO (SC+MIMO). As shown, the ACK/NACK codebook size maybe 8 that may be denoted as A/N(8). For type A transmission, theHS-DPCCH format may include 8 bits of CQI+2 bits of PCI encoded by a(20, 10) Reed Muller code. For type B transmission, the HS-DPCCH formatmay include a CQI table of 5 bits encoded by a (20, 7) Reed Muller code.As shown in 2B, the format of the CQI table may be denoted asCQI(20,7/10).

FIG. 2C shows an example HS-DPCCH format for dual carrier operation(DC). The ACK/NACK codebook size may be 10 that may be denoted asA/N(10). The HS-DPCCH format may include a CQI table of 10 bits encodedby a (20, 10) Reed Muller code that may be denoted as CQI(20,10).

FIG. 2D shows an example HS-DPCCH format for dual carrier operation withMIMO (DC+MIMO). The ACK/NACK codebook size may be 50 that may be denotedas A/N(50). For type A transmission, the HS-DPCCH format may include aCQI table of 8 bits of CQI+2 bits of PCI encoded by a (20, 10) ReedMuller code. For type B, the HS-DPCCH format may include a CQI table of5 bits of CQI+2 bits of precoding control information (PCI) encoded by a(20, 7) Reed Muller code. As shown in 2D, the format of the CQI tablemay be denoted as CQI(20,7/10). As shown in 2D, the CQI/PCI informationfor carriers 1 and 2 may be time multiplexed.

FIG. 3 shows an HS-DPCCH format. As shown a subframe 310 may includethree time slots 320, 330, and 340. The HS-DPCCH may be configured usingbinary phase shift keying (BPSK) modulation with a spreading factor of256, and a single channelization code. The HARQ-ACK field 350 allocatedfor carrying the acknowledgement feedback may take one time slot such astime slot 320 that may contain 10 bits. The CQI/PCI field 360 may beassigned two time slots such as time slot 330 and 340 with a total of 20bits. The HARQ-ACK field 350 may carry the feedback for up to twoHS-DSCH cells with MIMO and the CQI/PCI field 360 may carry the feedbackfor up to two HS-DSCH cells with MIMO alternating between each cell intime division multiplexing (TDM) fashion. The HARQ-ACK and CQI/PCIfields 350 and 360 may be coded and transmitted independently.

Example embodiments are described under the context of 3GPP UniversalMobile Telecommunications System (UMTS). To simplify the description inthe context of UMTS, the following definitions may be applicable. Forexample, “Secondary_Cell_Enabled” may describe whether the WTRU isconfigured with secondary serving cell(s). “Secondary_Cell_Active” maydescribe whether the WTRU is configured with active secondary servingcell(s). If the WTRU is configured with one or multiple secondaryserving HS-DSCH cells, Secondary_Cell_Enabled may be 1; otherwiseSecondary_Cell_Enabled may be 0 and Secondary_Cell_Active may be 0.Secondary_Cell_Active may be 1 when Secondary_Cell_Enabled is 1 and atleast one of the secondary serving HS-DSCH cells is activated (e.g., viaHS-SCCH orders); otherwise, Secondary_Cell_Active may be 0. “Number_ofSecondary_Active_Cells” may describe the number of active secondaryserving cells. For example, if Secondary_Cell_Enabled is 1 andSecondary_Cell_Active is 1, Number_of Secondary_Active_Cells may equalto 1, 2, or 3, indicating the number of HS-DSCH cells that areactivated; otherwise, Number_of Secondary_Active_Cells may be set to 0.

The term “HS-DSCH cell” may also be referred to as “cell”, “servingcell,” “carrier” and “downlink carrier,” and they may be usedinterchangeable herein. Further, an HS-DSCH cell may include a primaryserving HS-DSCH cell and/or a secondary serving HS-DSCH cell. The terms“composite PCI/CQI,” “PCI/CQI” and “CQI” may be used interchangeablyherein.

When the WTRU is configured for multiple-carrier operation, the HS-DPCCHsubframe structure may be of length 2 ms (3×2560 chips). A subframe mayinclude 3 slots, each of length 2560 chips. HARQ-ACK may be carried inthe first slot of the HS-DPCCH sub-frame. CQI, and in case the WTRU isconfigured in MIMO mode, PCI, may be carried jointly in the second andthird slot of the HS-DPCCH sub-frame.

In an embodiment, an HS-DPCCH slot format may accommodate more than twoserving cells. For example, a single HS-DPCCH channelization code may beused to carry the feedback signaling related to downlink HS-DSCHtransmission from three, four, or more serving HS-DSCH cells.

Table 1 shows example slot formats for the HS-DPCCH. As shown, slotformat 1 may carry 20 bits per slot. The spreading factor may be 128,and there may be 20 bits per uplink HS-DPCCH slot. Slot format 1 mayindicate that a subframe may carries 60 bits, the channel bit rate maybe 30 kilobits per second (kbps), a time slot may carries 20 bit, and/orthere may be three slots per subframe.

TABLE 1 Slot Channel Channel Transmitted Format Bit Rate Symbol Bits/Bits/ slots per #i (kbps) Rate (ksps) SF Subframe Slot Subframe 0 15 15256 30 10 3 1 30 30 128 60 20 3

FIG. 12 illustrates an example feedback information transmission. Asshown, at 1210, a HS-DPCCH slot format may be determined. For example,the determination may be performed via a processor of the WTRU, such asthe processor 118 described above with respect to FIG. 1B. For example,HS-DPCCH slot format may be determined based on, the number ofconfigured secondary cells, and/or the number of cells that may beconfigured with MIMO.

In an embodiment, if more than one secondary cell is configured, theHS-DPCCH slot format 1 shown in Table 1 may be used. For example, if thenumber of configured secondary cells equals to 2, or parameterSecondary_Cell_Enabled is 2, and MIMO is configured in at least onecell, the HS-DPCCH slot format 1 shown in Table 1 may be used. Forexample, if the number of configured secondary cells equals to 3, theHS-DPCCH slot format 1 shown in Table 1 may be used. For example, if theWTRU is configured with more than one secondary serving cells and thereis one active secondary cell, or parameter Secondary_Cell_Active=1, theHS-DPCCH slot format 1 shown in Table 1 may be used. For example, if thenumber of active secondary active cell is greater than one, or parameterNumber_of Secondary_Active_Cells>1, the HS-DPCCH slot format 1 shown inTable 1 may be used.

In an embodiment, if less than two secondary cells areconfigured/enabled, the HS-DPCCH slot format 0 shown in Table 1 may beused. For example, if more than two secondary serving cells areconfigured and less than two secondary serving cells are active,HS-DPCCH slot format 0 shown in Table 1 may be used.

At 1220, feedback information may be transmitted in accordance with thedetermined HS-DPCCH slot format. For example, the feedback informationmay be transmitted via a transceiver of the WTRU, such as thetransceiver 120 described above with respect to FIG. 1B.

In an embodiment, the spreading factor for the HS-DPCCH frame structuremay be reduced. For example, the spreading factor may be reduced from256 to 128. As shown in Table 1, the spreading factor in HS-DPCCH slotformat #1 is 128. This may increase the number of bits transmitted persubframe such that feedback information for three or more serving cellsmay be transmitted in a subframe. For example, the number of availablebits for HS-DPCCH may be doubled per subframe when the spreading factormay be reduced from 256 to 128. The same BPSK encoding may be used. Oneslot may be dedicated to HARQ-ACK and two slots may be allocated toCQI/PCI. For example, the HARQ-ACK field may contain 20 bits and CQI/PCIfield may contain 40 bits per subframe.

In an embodiment, the feedback fields with double the number of bits maybe jointly encoded. A single composite feedback codebook may betransmitted with the sizes described in Table 2. Table 2 shows downlinkconfigurations for HS-DPCCH feedback transmission. Table 2 is presentedin the order of the total number of transport blocks to be transmitted.As shown in Table 2, the design complexity becomes more substantial asthe size of the table grows exponentially as a function of the number oftransport blocks.

TABLE 2 Number of Number of Number of ACK/NACK Configuration transportHSDPA carriers codebook size Max CQI/PCI size case # blocks Carrierswith MIMO (number of codes) (bits) 1 3 3 0   3 × 3 × 3 − 1 = 26      5 +5 + 5 = 15 2 4 3 1   3 × 3 × 7 − 1 = 62     5 + 5 + 10 = 20 3 4 4 0 3 ×3 × 3 × 3 − 1 = 80    5 + 5 + 5 + 5 = 20 4 5 3 2   3 × 7 × 7 − 1 = 146    5 + 10 + 10 = 25 5 5 4 1 3 × 3 × 3 × 7 − 1 = 188    5 + 5 + 5 + 10 =25 6 6 3 3   7 × 7 × 7 − 1 = 342    10 + 10 + 10 = 30 7 6 4 2 3 × 3 × 7× 7 − 1 = 440   5 + 5 + 10 + 10 = 30 8 7 4 3 3 × 7 × 7 × 7 − 1 = 1028 5 + 10 + 10 + 10 = 35 9 8 4 4 7 × 7 × 7 × 7 − 1 = 2400 10 + 10 + 10 +10 = 40

In an embodiment, the feedback fields may be split into multiplefeedback channels, such as two feedback channels. Each feedback channelmay include the information field generated for ACK/NACK or CQI/PCIfeedback for one or more downlink carrier(s)/serving cell(s). A feedbackchannel may also refer to “feedback group,” “feedback pair,” “feedbackmessage,” or “feedback codeword,” and the terms may be usedinterchangeably in this application. A feedback group may include one ormore serving cells. A feedback channel may include or may carry feedbackinformation for a feedback group. In an embodiment, conventional codingschemes for ACK/NACK or CQI/PCI feedback may be reused without requiringextensive optimal codebook search.

In an embodiment, feedback information for the different feedbackchannels may be jointly coded such that coding gain may be realized. Inan embodiment, feedback information for different feedback channels maybe coded independently. The separation of the feedback channels may becarried out at the physical layer mapping. The coded bits from thefeedback channels may be mapped to HS-DPCCH symbols using atime-division multiplexing approach.

The feedback channels/groups may be separated via a HS-DPCCH subframeformat with multiple HARQ-ACK fields and multiple CQI/PCI feedbackfields. For example, an HS-DPCCH subframe may include two HARQ-ACKfields and two CQI/PCI feedback fields. Channel coding for each feedbackchannel may be defined and applied independently to each field. Thecoded bits may be mapped to HS-DPCCH symbols in the order defined by theHS-DPCCH frame format.

In an embodiment, a feedback channel may carry ACK/NACK and CQI/PCIfeedback fields for up to two downlink HS-DSCH serving cells/carriers.Each feedback field may be coded jointly. For example, a feedbackchannel may carry regular and/or composite HARQ-ACK codewords, andregular CQI and/or composite PCI/CQI codewords. A composite HARQ-ACKcodeword may include an HARQ-ACK codeword that may carry feedbackinformation for up to two serving cells. A composite PCI/CQI codewordmay carry the feedback for up to one cell with MIMO support and twocells with MIMO support when used in TDM fashion. Two feedback channelsmay support up to four downlink HS-DSCH serving cells, including servingcells with MIMO configured. Hereinafter, the two feedbackchannels/feedback codewords/feedback groups may be denoted as HS-DPCCH1and HS-DPCCH2.

FIG. 13 illustrates example feedback information transmission. As shown,at 1310, serving cells may be grouped into feedback groups. For example,serving cells may be grouped via a processor of the WTRU, such as theprocessor 118 described above with respect to FIG. 1B, and/or via atransceiver of the WTRU, such as the transceiver 120 described abovewith respect to FIG. 1B.

In an embodiment, the feedback information from the multiple HS-DSCHserving cells may be organized into feedback pairs or feedback groups.For example, the serving cells may be grouped into two feedback groups.A feedback group may include one or more HS-DSCH serving cells. Forexample, a feedback group may include up to two HS-DSCH serving cells. Afeedback group may be processed collectively. For example, the HARQ-ACKfeedback may be encoded into a 10 bit field and CQI/PCI feedback may beencoded into a 20 bit binary field.

In an example, the serving HS-DSCH cell and the first secondary servingHS-DSCH cell may be grouped to form a first feedback group, and thethird and forth secondary serving HS-DSCH cells can be grouped to form asecond feedback group. In an example, the WTRU may be configured with 3carriers, e.g. two secondary serving HS-DSCH cells are configured. Oneof the feedback groups may include two HS-DSCH cells, and the otherfeedback group may include the remaining cell. The remaining cell mayinclude the serving HS-DSCH cell or one of the secondary serving HS-DSCHcells.

The HS-DPCCH frame format with the smaller spreading factor of 128 maybe divided to transmit two feedback codewords. A feedback codeword maycarry feedback information for a feedback group or feedback channel. Afeedback group may be formed by grouping the feedback information ofmultiple HS-DSCH cells or carriers. A feedback codeword may include 30bits.

In an embodiment, the HS-DPCCH frame format may be split via a per-fieldsplit. Individual feedback field such as the HARQ-ACK field and theCQI/PCI field may be split into multiple portions. For example,individual feedback field may be split into halves. A feedback codewordmay be formed by aggregating the portion of the HARQ-ACK field(s) thatcorrespond to the respective feedback group, and the portion of theCQI/PCI field that correspond to the respective feedback group. TheHARQ-ACK fields may be mapped to a first portion of the feedbackcodewords in the subframe, and the PCI/CQI fields may be mapped to asecond portion of the feedback codewords.

FIG. 4 illustrates an example HS-DPCCH frame format. As shown a subframe410 may include three time slots 420, 430 and 440. For example, thefirst time slot such as time slot 420 may be allocated to transmitHARQ-ACK information. The second and third time slot may be allocated totransmit CQI/PCI information. As shown, a time slot such as time slot420 may be partitioned into two portions 450 and 460. Codeword 1 andcodeword 2 may be transmitted in subframe 410. For example, codeword 1may include feedback information for a first feedback group, andcodeword 2 may include feedback information for a second feedback group.For example, the ACK/NACK feedbacks for serving HS-DSCH cell and a firstsecondary serving HS-DSCH cell may be grouped into codeword 1 andencoded into a 10 bit HARQ-ACK field. As shown, the portion 450 may beused to transmit HARQ-ACK information of codeword 1. The ACK/NACKfeedbacks for a second and a third secondary serving HS-DSCH cells maybe grouped into codeword 2 and encoded into another 10 bit HARQ-ACKfield. As shown, the portion 460 may be used to transmit HARQ-ACKinformation of codeword 2. For example, the CQI/PCI feedbacks forserving HS-DSCH cell and the first secondary serving HS-DSCH cell may begrouped into codeword 1 and encoded into a 20 bit CQI/PCI field. Asshown, time slot 430 may be mapped to transmit CQI/PCI feedbackinformation of codeword 1. The CQI/PCI feedbacks for second and thirdsecondary serving HS-DSCH cells may be grouped into codeword 2 andencoded into another 20 bit CQI/PCI field. As shown, time slot 440 maybe mapped to transmit CQI/PCI feedback information of codeword 2.

In an embodiment, the HS-DPCCH frame format may be split via a per-timeslot split. A time slot in the HS-DPCCH subframe may be split intomultiple portions. For example, each time slot in the HS-DPCCH subframemay be split into halves. A feedback codeword may be formed byaggregating a portion of each time slot. For example, a first feedbackcodeword may be formed by aggregating the first halves of each timeslot, and a second feedback codeword may formed by aggregating theremaining halves of each time slot. A feedback codeword may have anaggregate size of 30 bits distributed over 3 parts of 10 bits each. Forexample, the HARQ-ACK fields associated with each HS-DSCH cell or groupof HS-DSCH cells may be mapped to a first portion of a codeword, and thePCI/CQI fields may then be mapped to a second and a third portion of thecodeword.

FIG. 5 illustrates an example HS-DPCCH frame format. As shown, codeword1 and codeword 2 may be transmitted in a subframe 510 that may includethree time slots 520, 530 and 540. For example, each time slot may bepartitioned into two portions. As shown, time slot 520 may bepartitioned into two portions 550 and 560, time slot 530 to portions 570and 580, and time slot 540 to portions 590 and 595. For example,codeword 1 may include feedback information for a first feedback group,and codeword 2 may include feedback information for a second feedbackgroup. As shown, codeword 1 may be partitioned into 3 parts, part 1,part 2, and part 3, and codeword 2 may be partitioned into 3 parts, part1, part 2, and part 3. Each codeword part may be transmitted in a timeslot portion.

In an example, the HARQ-ACK fields may be mapped to part 1 of thefeedback codeword 1, and may be transmitted in time slot portion 550.The PCI/CQI fields may be mapped to parts 2 and 3 of the feedbackcodeword 1, and may be transmitted in timeslot portions 570 and 590.

In an example, the HARQ-ACK fields may be mapped to part 2 of thefeedback codeword 1, and may be transmitted in time slot portion 570.The PCI/CQI fields may be mapped to parts 1 and 3 of the feedbackcodeword 1, and may be transmitted in timeslot portions 550 and 590.

Turning back to FIG. 13, at 1320, channel coding may be applied to thefeedback information for the feedback groups. For example, channelcoding may be applied via a processor of the WTRU, such as the processor118 described above with respect to FIG. 1B, and/or via a transceiver ofthe WTRU, such as the transceiver 120 described above with respect toFIG. 1B.

At 1330, the feedback information for the feedback groups may beconcatenated to form composite feedback information. In an embodiment,channel coding for a field of each of the multiple feedback groups maybe performed independently. For example, the feedback information forthe feedback groups may be concatenated via a processor of the WTRU,such as the processor 118 described above with respect to FIG. 1B,and/or via a transceiver of the WTRU, such as the transceiver 120described above with respect to FIG. 1B.

When HS-DPCCH slot format 1 described in Table 1 is used, feedbackinformation that correspond to multiple feedback groups may beconcatenated. The feedback codewords may be concatenated prior to beingmapped to physical channels. In an embodiment, concatenation may not beperformed if physical channel mapping block or entity ensures thatproper channel mapping is performed.

FIG. 6 illustrates an example coding flow for HARQ-ACK messages. Forexample, data input bits to the coding unit may include HARQ-ACKmessages for HS-DSCH cells. The feedback information data for theHS-DSCH cells may be grouped into multiple, such as two sets, and may betransmitted via separate feedback codewords. For example, a set maycarry feedback information for up to two HS-DSCH cells, and may beincluded in a feedback codeword.

As shown in FIG. 6, HARQ-ACK associated with a first feedback group 610may include feedback information for a first feedback group, andHARQ-ACK associated with a second feedback group 620 include feedbackinformation for a second feedback group. Channel coding for HARQ-ACKassociated with the first feedback group 610 and HARQ-ACK associatedwith the second feedback group 620 may be performed independently orseparately via channel coding unit/function 650 and channel codingunit/function 660. Channel coding may be performed in parallel orsequentially and may be time-multiplexed.

As shown in FIG. 6, output of the two channel coding units 650 and 660may be concatenated. HARQ-ACK message associated with the first feedbackgroup 630 and HARQ-ACK message associated with the second feedback group640 may be concatenated via concatenation unit 670 form output bits 675.For example, HARQ-ACK message associated with the first feedback group630 may be denoted as w¹ ₀, w¹ ₁, . . . , w¹ ₉, and HARQ-ACK messageassociated with the second feedback group 640 may be denoted as w² ₀, w²₁, . . . , w² ₉. Bits w¹ ₀, w¹ ₁, . . . , w¹ ₉ and w² ₀, w² ₁, . . . ,w² ₉ may be concatenated to form w₀, w₁, . . . , w₁₉. As shown, theoutput bits of the concatenation unit 675 may be fed into physicalchannel mapping function 680 to be mapped to physical channel 690.

FIG. 7 illustrates an example coding flow for CQI or PCI/CQI reports.For example, data input bits to the coding unit may include CQI, type ACQI/PCI and/or type B CQI/PCI for one or more HS-DSCH cells. Forexample, if a feedback group includes a HS-DSCH cell configured in MIMOmode, the measurement indication for the feedback group may includeprecoding control indication (PCI) and channel quality indication (CQI).The feedback information data for the HS-DSCH cells may be grouped intomultiple, such as two sets, and may be transmitted via separate feedbackcodewords. For example, a set may carry CQI, type A CQI/PCI and/or typeB CQI/PCI for up to two HS-DSCH cells, and may be included in a feedbackcodeword.

As shown in FIG. 7, CQI, CQI/PCI type A, and/or CQI/PCI type Bassociated with a first feedback group 710 may include CQI, CQI/PCI typeA, and/or CQI/PCI type B associated with a second feedback codeword 720may include feedback information for a second feedback group. Channelcoding for CQI, CQI/PCI type A, and/or CQI/PCI type B report(s)associated with the first feedback group 710 and CQI/PCI type A, and/orCQI/PCI type B report(s) associated with the second feedback codeword720 may be performed independently or separately via channel codingunit/function 730 and channel coding unit/function 740. Channel codingmay be performed in parallel or sequentially and may betime-multiplexed.

As shown in FIG. 7, output of the two channel coding units/functions 730and 740 may be concatenated. CQI, CQI/PCI type A, and/or CQI/PCI type Breport(s) associated with the first feedback group 750 and CQI, CQI/PCItype A, and/or CQI/PCI type B report(s) associated with the secondfeedback group 760 may be concatenated via concatenation unit/function770 form output bits 780. For example if a single HS-DSCH cell maycorrespond to a given feedback group, and the total number of CQIinformation bits may be 5, otherwise and the total number of CQIinformation bits may be 10 bits. For example, CQI, CQI/PCI type A,and/or CQI/PCI type B report(s) associated with the first feedback group750 may be denoted as b¹ ₀, b¹ ₁, . . . , b¹ ₁₉, and CQI, CQI/PCI typeA, and/or CQI/PCI type B report(s) associated with the second feedbackcodeword 760 may be denoted as b² ₀, b² ₁, . . . , b² ₁₉. Bits b¹ ₀, b¹₁, . . . , b¹ ₁₉ and b² ₀, b² ₁, . . . , b² ₁₉ may be concatenated toform b₀, b₁, . . . , b₃₉. As shown, the output bits of the concatenationunit 780 may be fed into physical channel mapping function 790 to bemapped to physical channel 795.

For example, when a feedback codeword carries the feedback informationfor dual HS-DSCH cells that may not be configured in MIMO mode, inputbits 710 may include CQI for the first feedback group or CQI associatedwith first feedback codeword, and input bits 720 may include CQI for thesecond feedback group, or CQI associated with a second feedback codeword720. When a feedback codeword carries the feedback information for dualHS-DSCH cells and both cells are configured in MIMO mode, input bits 710may include CQI/PCI type A or CQI/PCI type B report(s) for the firstfeedback group, or CQI/PCI type A or CQI/PCI type B report(s) associatedwith the first feedback codeword. Input bits 720 may include CQI/PCItype A or CQI/PCI type B report(s) for the second feedback group, orCQI/PCI type A or CQI/PCI type B report(s) associated with the secondfeedback codeword. When the feedback channel carries the feedbackinformation for dual HS-DSCH cells with one being configured in MIMOmode, input bits 710 may include CQI/PCI type A or CQI/PCI type Breport(s) for the feedback group configured with MIMO, and input bits720 may include CQI for the feedback group not configured with MIMO.

When HS-DPCCH operates with two feedback codewords, the HS-DPCCHconcatenation function may concatenate the outputs of the channel codingfunctions from the two feedback codewords, w¹ _(k), w² _(k) forHARQ-ACK, and, b¹ _(k),b² _(k) for CQI/PCI. For example, the outputs ofthe channel coding functions may be concatenated as follows: w₀, w₁, . .. , w₉, w₁₀, w₁₁, . . . , w₁₉=w¹ ₀, w¹ ₁, . . . , w¹ ₉, w² ₀, w² ₁, . .. , w² ₉

b₁, . . . , b₉, b₁₀, . . . , b₁₉, b₂₀, . . . , b₂₉, b₃₀, . . . , b₃₉=b¹₀, b¹ ₁, . . . , b¹ ₁₉, b² ₀, b² ₁, . . . , b² ₁₉.

After the concatenation function, the HS-DPCCH physical channel mappingfunction may map the input bits w_(k) directly to the physical channelsuch that the bits may be transmitted over the air in ascending order orin descending order with respect to k. The HS-DPCCH physical channelmapping function may map the input bits b_(k) directly to the physicalchannel such that bits may be transmitted over the air in ascendingorder or in descending order with respect to k.

In an embodiment, the feedback information for the multiplecarriers/cells may be grouped into multiple feedback groups. Forexample, feedback information may be grouped into two feedback groups.Each feedback group may be assigned to a corresponding the feedbackcodeword. If a feedback codeword includes feedback information for nomore to than two carriers/cells, the standard coding schemes for eitherHARQ-ACK or CQI/PCI may be reused. Table 3 lists example coding schemesthat may be reused.

TABLE 3 3GPP Release Release 6 Release 7 Release 8 Release 9 CarrierConfiguration SC SC + MIMO DC DC + MIMO Max. Number of 1 2 2 4 Transportblocks Num of carriers 1 1 2 2 HARQ-ACK A/N(4) A/N(8) A/N(10) A/N(50)CQI/PCI CQI(20, 5) CQI(20, 7/10) CQI(20, 10) CQI(20, 7/10)

As shown in Table 3, the Release 8 (dual carrier) and Release 9 (dualcarrier with MIMO) coding schemes may provide feedback for two carrierssimultaneously. The feedback resource for the dual carrier or dualcarrier with MIMO coding schemes may be referred to as feedback slotherein.

As the amount of feedback information may depend on the number oftransport blocks in each of the carrier configurations, the codingschemes in Table 3 may have different coding rates and therefore mayresult in different coding performances.

In an embodiment, feedback information for the carrier(s) may be mappedto a first feedback codeword. Feedback information may be first mappedto the first codeword. If the first feedback codeword is fully occupiedwith data, feedback information for the remaining carrier(s) may bemapped to a second feedback codeword. If the second feedback codewordhas the capacity to carry more feedback information, feedbackinformation mapped to the first feedback codeword, or a portion thereof,may be repeated in the second feedback codeword.

For example, when the WTRU is configured with one or two active servingcells, the feedback information for the active serving cells may berepeated to fill a subframe. For example, feedback information foractive carriers may fit into the first feedback codeword. The feedbackinformation can be duplicated into second feedback codeword such thatthe feedback information for active carriers may be repeated. This mayimprove transmission reliability.

For example, when there are two active carriers (e.g., C1 and C3, or C1and C2, or any other combinations), the feedback information for the twoactivated carriers may fit into the first feedback codeword. Thefeedback information for the two activated carriers may be repeated tofill the second feedback codeword.

FIG. 8 illustrates an example HS-DPCCH frame format. As shown, subframe810 may include time slot 1 820, time slot 2 830 and time slot 3 840.Time slot 1 820 may be mapped to HARQ-ACK field of the feedbackinformation, and time slot 2 830 and time slot 3 840 may be mapped toCQI field of feedback information. For example, two carriers or twoserving cells such as a serving HS-DPCCH cell, and a secondary servingHS-DPCCH cell may be active. The two cells may be denoted as C1 and C2.In an embodiment, the two active carriers/cells such as C1 and C2 may begrouped in a feedback group, and feedback information for the twocarriers/cells may be contained in a feedback codeword. HARQ-ACKinformation for C1 and C2 may be jointly encoded and repeated to fillthe whole HARQ-ACK slot such as slot 1 820 of the HS-DPCCH subframe. Asshown in FIG. 8, HARQ-ACK information for C1 and C2 mapped to portion822 of time slot 1 820 may be repeated in portion 826 of time slot 1820. CQI information for C1 and C2 may be repeated to fill the two slotCQI field that may include time slot 2 830 and time slot 3 840 of theHS-DPCCH subframe. As shown in FIG. 8, CQI information for C1 and C2mapped to time slot 2 830 may be repeated in time slot 3 840 of theHS-DPCCH subframe.

For example, the WTRU may be configured with three serving cells, suchas a primary serving cell and two configured secondary serving cells.The two enabled secondary serving cells may include an active secondaryserving cell and a deactivated secondary serving cell. The WTRU may beconfigured with four serving cells, such as a primary serving cell andthree configured secondary serving cells. The three configured secondaryserving cells may include an active secondary serving cell and twodeactivated secondary serving cells. The HARQ-ACK information for theprimary serving cell and the HARQ-ACK information for the activesecondary serving cell may be jointly encoded. For example, jointlycoded HARQ feedback information may be formed. The jointly coded HARQfeedback information may be transmitted in a portion of a time slotallocated for HARQ feedback transmission, for example, portion 822 oftime slot 1 820. The jointly coded HARQ feedback information may berepeated in a second portion of the time slot allocated for HARQfeedback transmission, for example, portion 826 of time slot 1 820. Forexample, the jointly coded HARQ feedback information may be repeated tofill the whole HARQ field of a subframe such as subframe 810.

For example, the WTRU may be configured with three or four servingcells, such as a primary serving cell and two or three configuredsecondary serving cells. The configured secondary serving cells mayinclude at least one deactivated secondary serving cell. The CQIinformation for each active cell may be repeated to fill the time slotsallocated for CQI transmission. For example, the CQI information foreach active cell may be repeated such that the two time slot PCI/CQIfield in the HS-DPCCH sub-frame may be filled.

In an embodiment, the carrier or cell to feedback group mapping may beadjusted when carrier activation status changes such that feedbackinformation for active carriers may be repeated to fill the HS-DCSHsubframe. For example, C1 and C2 may be activated initially, and the twocarriers may be grouped in a feedback group. Subsequently, C2 may bedeactivated and C3 may be activated. C2 may be taken off the feedbackgroup, and C3 may be grouped with C1. In other words, feedbackinformation for C1 and C3 may be remapped to be on the same feedbackcodeword that may be repeated to fill the HS-DCSH subframe.

For example, the WTRU may be configured with two or three secondaryserving HS-DSCH cells. When there is one active secondary cell, feedbackinformation for serving HS-DSCH cell and the active secondary servingHS-DSCH cell may be jointly encoded and repeated to fill the whole slotthat may carry the corresponding feedback information in a HS-DSCHsubframe.

In an embodiment, the WTRU may be configured with two secondary servingHS-DSCH cells, or three serving HS-DSCH cells. The CQI or PCI/CQI fieldfor a deactivated cell may be DTXed. For example, when a secondaryserving cell is deactivated, the CQI report for the cell may not betransmitted.

FIG. 9 illustrates an example HS-DPCCH frame format. As shown, a firstsubframe 910 may include time slot 1 920, time slot 2 930 and time slot3 940. And a second subframe 915 may include time slot 1 950, time slot2 960 and time slot 3 970. Time slot 1 920 of subframe 1 910 and timeslot 1 950 of may be mapped to HARQ-ACK field of the feedbackinformation. Time slot 2 930 and time slot 3 940 of subframe 1 910, andtime slot 2 960 and time slot 3 970 of subframe 2 915 may be mapped toCQI field of feedback information.

For example, three carriers or three serving cells such as a servingHS-DPCCH cell, and two secondary serving HS-DPCCH cells may be active.As shown in FIG. 9, the three cells may be denoted as C1, C2 and C3. Inan embodiment, two active carriers/cells such as C1 and C2 may begrouped in a feedback group such as feed back group 1, and C3 may beincluded in a second feedback group such as feedback group 2. HARQ-ACKinformation for C1 and C2 may be jointly encoded, and may be mapped to aportion of a HARQ-ACK slot of a subframe. As shown in FIG. 9, HARQ-ACKinformation for C1 and C2 may be mapped to portion 922 of time slot 1920 of subframe 1 910 and portion 952 of time slot 1 950 of the subframe2 915. HARQ-ACK information for C3 may be mapped to portion 926 of timeslot 1 920 of subframe 1 910 and portion 956 of time slot 1 950 of thesubframe 2 915.

In an embodiment, the cell that is not grouped with another cell, suchas C3 may be encoded individually with a (20, 5) or (20, 10/7)Reed-Muller code and may be transmitted in a time slot allocated to afeedback group such as feedback group 2. For example, CQI report for C3may be transmitted in time slot 3 940. For example, the WTRU may beconfigured with three secondary cells, or four serving cells, and oneserving cell is deactivated. The CQI report for the cell may not betransmitted, or may be DTXed. As shown in FIG. 9, slot 3 970 of subframe2 915 may be mapped to a deactivated serving cell, and may not transmitany feedback information.

In an embodiment, a CQI feedback cycle may include more than onesubframe. For example, the WTRU may be configured with the CQI feedbackcycle parameter equal to two or greater than two sub-frames (e.g., >=4ms). The grouped or paired CQI reports may be transmitted in a timedivision multiplexing (TDM) fashion. For example, the CQI feedbackinformation for each serving HS-DSCH cell may be encoded individuallyand may be transmitted in different sub-frames.

In an embodiment, CQI/PCI reports for serving cells may be encodedindividually. In an embodiment, when the WTRU is not configured in MIMOmode in any of the serving cells, the WTRU may encode two CQI feedbackreports jointly and may transmit the CQI reports in a subframe.

In an embodiment, CQI reporting format may not depend on any MIMOconfiguration status of the cells. The CQI/PCI reports may be encoded by(20, 7/10) or (20,5) Reed Muller codes depending on the MIMOconfiguration status of the associated cells. The encoded CQI/PCIreports may be grouped or paired in feedback groups. For example, theremay be two feedback codewords in a group, and the feedback codewords maybe transmitted in a TDM fashion in time slots allocated for theassociated group in different subframes such as consecutive subframes.

For example, as shown in FIG. 9, the CQI feedback cycle may include twosubframes such as subframe 1 910 and subframe 2 915. Time slot 2 930 andtime slot 3 940 of subframe 1 910, and time slot 2 960 and time slot 3970 of subframe 2 915 may be mapped to the CQI field of feedbackinformation. As shown, CQI reports for C1 and C2 may be transmitted insubframe 1 910, in time slot 2 930 and time slot 3 940 respectively. CQIreport for C3 may be transmitted in subframe 2 915, for example, in timeslot 2 960.

In an embodiment, CQI information for each serving cell in a feedbackgroup may be independently encoded.

Table 4 shows channel coding schemes and power offset setting rules forHS-DPCCH CQI slots. In Table 4, the columns showing “CQI type ofHS-DPCCH” is related to channel coding schemes for encoding CQI reports.A table cell containing two CQI types may indicate that the CQI/PCIreports may be encoded separately for each of the two serving cells inthe feedback group. For example, “SC” may indicate (20, 5) Reed Mullercode, “DC” may indicate (20,10) code, and SC-MIMO may indicate (20,10)code for Type A CQI report or (20, 7) for type B CQI report.

TABLE 4 # of activated CQI # of carriers CQI type of Rule applying CQItype of Rule applying activated with MIMO HS-DPCCH2 to HS-DPCCH2HS-DPCCH1 to HS-DPCCH1 carriers configured CQI slot CQI slot CQI slotCQI slot 1 0 SC 3D SC 3D 1 SC-MIMO 1C or 3C SC-MIMO 1C or 3C 2 0 DC 2DDC 2D 1 SC 1C or 3C SC 1C or 3C SC-MIMO SC-MIMO 2 SC-MIMO 1C or 3CSC-MIMO 1C or 3C SC-MIMO SC-MIMO 3 0 SC 3C SC 3C SC 1 SC MIMO 1C or 3CSC 3C SC SC 3C SC 1C or 3C SC-MIMO 2 SC 3C SC-MIMO 1C or 3C SC-MIMOSC-MIMO 1C or 3C SC 1C or 3C SC-MIMO 3 SC-MIMO 1C or 3C SC-MIMO 1C or 3CSC-MIMO 4 0 DC 2C SC 3C SC 1 DC 2C SC 1C or 3C SC-MIMO SC 1C or 3C SC 3CSC-MIMO SC 2 DC 2C SC-MIMO 1C or 3C SC-MIMO SC 1C or 3C SC 1C or 3CSC-MIMO SC-MIMO SC-MIMO 1C or 3C SC 3C SC-MIMO SC 3 SC 1C or 3C SC-MIMO1C or 3C SC-MIMO SC-MIMO SC-MIMO 1C or 3C SC 1C or 3C SC-MIMO SC-MIMO 4SC-MIMO 1C or 3C SC-MIMO 1C or 3C SC-MIMO SC-MIMO

Relative power offsets may be applied to different feedback signals inHS-DPCCH such that performance requirements for the HARQ acknowledgementand CQI feedbacks may be balanced. For example, three power offsetvalues, such as Δ_(ACK), Δ_(NACK) and Δ_(CQI), may be configured by thenetwork and applied to ACK, NACK, and CQI feedback signals,respectively. In an embodiment, conventional coding schemes may bereused.

In an embodiment, the network may pre-configure multiple sets of poweroffset values for multiple feedback groups, with one set of power offsetvalue corresponding to a feedback group. For example, two sets of poweroffset that may be denoted as Δ_(ACK1), Δ_(NACK1), Δ_(CQI1) andΔ_(ACK2), Δ_(NACK2), Δ_(CQI2) for two feedback groups at the initialradio resource control (RRC) connection. The WTRU may apply the two setsof values to the two feedback groups, respectively, when the HS-DPCCH istransmitted.

In an embodiment, the network may configure one set of power offsetvalues, e.g., Δ_(ACK), Δ_(NACK), Δ_(CQI), at initial RRC connection.When a WTRU applies this set of offset value, the WTRU may add anadditional power scaling-down to the feedback channel with the strongercoding performance. The amount of this additional power scaling-down maybe pre-defined in the standards or may vary depending on thecarrier/MIMO configurations. For example, the power scaling-down may beto step down a few entries in the quantization table that maps thenetwork signaled value of Δ_(ACK), Δ_(NACK), and Δ_(CQI) to the actualpower scaling applied at the transmitter.

In an embodiment, the same power offset values may be applied tomultiple feedback groups such that changing transmission power in themiddle of an uplink slot due to half slot ACK/NACK transmission may beavoided. For example, the WTRU may calculate the power offset of each ofthe HS-DPCCH fields for the multiple feedback groups independently. TheWTRU may apply the highest calculated power set value to the multiplefeedback groups. For example, for each HS-DPCCH field, the WTRU mayapply the higher value of the two power offsets calculated for twofeedback groups. The WTRU may apply the average value of the calculatedpower set values to the multiple feedback groups. For example, for eachfield category, the average of the two power offsets calculated for thetwo feedback groups may be applied.

For example, when feedback information for two feedback groups istransmitted, there may be two HARQ-ACK fields that may be denoted asHARQ-ACK₁ and HARQ-ACK₂ and two PCI/CQI fields that may be denoted asPCI/CQI₁ and PCI/CQI₂. The WTRU may calculate the power offset for eachof these fields based on the signaled values such as Δ_(ACK1),Δ_(NACK1), Δ_(CQI1), Δ_(ACK2), Δ_(NACK2), Δ_(CQI2) and/or the actualfeedback being sent. The resulting power offsets for HARQ-ACK1 andHARQ-ACK2 may be denoted as Δ_(H-A1) and Δ_(H-A2), respectively, and theresulting power offsets for the PCI/CQI1 and PCI/CQI2 may be denoted asΔ_(PC1) and Δ_(PC2).

The WTRU may determine the maximum of multiple power offset valuescalculated for the HS-DPCCH fields, and apply the maximum power offsetvalue to the corresponding HS-DPCCH fields for multiple feedback groups.For example, the WTRU may choose the maximum of the two valuescalculated for HARQ ACK, which may be denoted as Δ_(H-A)=max(Δ_(H-A1),Δ_(H-A2)), and apply the maximum power offset Δ_(H-A) to HARQ-ACK fieldsof the two feedback groups. For example, the WTRU may choose the maximumof the two values calculated for CQI, which may be denoted asΔ_(PC)=max(Δ_(PC1), Δ_(PC2)), and may apply the selected maximum poweroffset (Δ_(PC)) to the PCI/CQI fields for the two feedback groups.

In an embodiment, power offsets may be applied to feedback groups. Forexample, the coding performance for the feedback groups may be unequal,and the transmission quality for the feedback groups in turn may beuneven. The variance may impact the uplink coverage of the multiplecarrier operation. Applying different power offsets to differentfeedback groups may mitigate the impact on the uplink coverage. Forexample, higher transmit power may be applied on a feedback group withrelatively weaker coding performance. For example, power offset for thePCI/CQI field for the first feedback group may differ from the poweroffset for the PCI/CQI field for the second feedback group.

In an embodiment, the network may configure one set of power offsetvalue that may be denoted as Δ_(ACK), Δ_(NACK), and Δ_(CQI) at theinitial RRC connection. When the WTRU applies the set of offset values,the WTRU may add an additional power boost to the feedback channel withthe weaker coding performance. The amount of this additional power boostmay be pre-defined or may vary depending on the carrier/MIMOconfigurations. For example, the power boost may be to step up a fewentries in the quantization table that maps the network signaled valueof Δ_(ACK), Δ_(NACK), and Δ_(CQI) to the actual power scaling applied atthe transmitter.

For example, the HARQ ACK power offset setting rule for a feedback groupmay be implemented as follows. If none of the HS-DSCH cells thatcorrespond to the feedback group is configured in MIMO mode, A_(hs) mayequal the quantized amplitude ratio translated from the signaled valueA_(ACK)+1 if the corresponding HARQ-ACK message contains at least oneACK but no NACK; A_(hs) may equal the quantized amplitude ratiotranslated from the signaled value Δ_(NACK)+1 if the correspondingHARQ-ACK message contains at least one NACK but no ACK; A_(hs) may equalthe quantized amplitude ratio translated from the maximum value of(Δ_(ACK)+1) and (Δ_(NACK)+1) if the corresponding HARQ-ACK messagecontains both ACK and NACK, or is a PRE or a POST. If at least oneHS-DSCH cell that correspond to the feedback group is configured in MIMOmode, A_(hs) may equal the quantized amplitude ratio translated from thesignaled value Δ_(ACK)+2 if the corresponding HARQ-ACK message containsat least one ACK but no NACK; A_(hs) may equal the quantized amplituderatio translated from the signaled value Δ_(NACK)+2 if the correspondingHARQ-ACK message contains at least one NACK but no ACK; A_(hs) may equalthe quantized amplitude ratio translated from the maximum value of(Δ_(ACK)+2) and (Δ_(NACK)+2) if the corresponding HARQ-ACK messagecontains both ACK and NACK, or is a PRE or a POST.

Table 5 shows the quantization of the power offset for HS-DPCCH. Asshown in Table 5, when the signaled values for Δ_(ACK), Δ_(NACK) and/orΔ_(CQI) is 10, the Quantized amplitude ratios A_(hs)=β_(hs)/β_(c) may beset to 48/15.

TABLE 5 Power Power Power Power Signalled offset offset offset offsetvalues for Quantized Power offset Step of step of Step of Step ofΔ_(ACK), Δ_(NACK) amplitude ratios of HS- (Δ + 1) (Δ + 2) (Δ + 3) (Δ +4) and Δ_(CQI) A_(hs =) β_(hs)/β_(c) DPCCH(dB) (dB) (dB) (dB) (dB) 16 190/15  22.0532468 15  150/15  20 2.053247 14  120/15  18.0617997 1.93823.991447 13  95/15 16.0326469 2.029153 3.967353 6.0206 12  75/1513.9794001 2.053247 4.0824 6.0206 8.073847 11  60/15 12.0411998 1.93823.991447 6.0206 7.9588 10  48/15 10.1029996 1.9382 3.876401 5.9296477.9588 9 38/15 8.07384675 2.029153 3.967353 5.905553 7.9588 8 30/156.02059991 2.053247 4.0824 6.0206 7.9588 7 24/15 4.08239965 1.93823.991447 6.0206 7.9588 6 19/15 2.05324684 2.029153 3.967353 6.02068.049753 5 15/15 0 2.053247 4.0824 6.0206 8.073847 4 12/15 −1.93820031.9382 3.991447 6.0206 7.9588 3  9/15 −4.436975 2.498775 4.4369756.490222 8.519375 2  8/15 −5.4600254 1.02305 3.521825 5.460025 7.5132721  6/15 −7.9588002 2.498775 3.521825 6.0206 7.9588 0  5/15 −9.54242511.583625 4.0824 5.10545 7.604225 max 2.498775 4.436975 6.490222 8.519375min 1.02305 3.521825 5.10545 7.513272 max 2.498775 4.436975 6.4902228.519375 min 1.02305 3.521825 5.10545 7.513272

In an embodiment, PRE or POST codeword for different feedback groups maybe transmitted independently. The PRE or POST codeword transmission maybe determined based on the content of the HARQ-ACK message associatedwith a particular feedback group across the neighbouring sub-frames.

For example, a HARQ preamble may be transmitted in a slot allocated toHARQ-ACK in sub-frame n−1, when in sub-frame n, if the informationreceived on HS-SCCH for a cell or cells in a feedback group is notdiscarded. The HARQ preamble may include PRE for HS-DPCCH slot format 0or PRE/PRE for HS-DPCCH slot format 1. A PRE/PRE may indicate that PREis transmitted on a first half of the time slot allocated to HARQ-ACK,and PRE is transmitted on a second half of the time slot allocated toHARQ-ACK in a subframe. For example, a HARQ preamble may be transmittedin a slot allocated to HARQ-ACK in sub-frame n−1, unless an ACK or NACKor any combination of ACK and NACK is to be transmitted in sub-framen−1. For example, the WTRU may transmit PRE/PRE for the feedback groupin sub-frame n−1, unless an ACK or NACK or any combination of ACK andNACK for the feedback group is to be transmitted in sub-frame n−1.

For example, the WTRU may transmit PRE/PRE in a slot allocated toHARQ-ACK in a subframe such as subframe n−1, when a DTX codeword is tobe transmitted in the subframe for each serving cell in the subframe,and at least one of ACK and NACK is to be transmitted in a subsequentsubframe such as n. The WTRU may transmit PRE/PRE in a subframe such assubframe n−1, when the HARQ-ACK messages for the serving cells are to beDTX'd in subframe n−1, and the HARQ-ACK message for at least one servingcell is not DTX'd in a subsequent subframe such as n.

If ACK or NACK or any combination of ACK and NACK is transmitted for thecell or the pair of cells in a feedback group sub-frame n, the WTRU maytransmit a postamble for the feedback group in sub-framen+2×N_acknack_transmit−1 unless ACK or NACK or PRE or any combination ofACK and NACK is to be transmitted for the feedback group in thissub-frame. Parameter N_acknack_transmit may include a repetition factorof ACK/NACK. Parameter N_acknack_transmit may be a system-configuredparameter.

For example, a HARQ postamble may be transmitted in the slot allocatedto HARQ-ACK in sub-frame n+2×N_acknack_transmit−2 when HARQ istransmitted a feedback group is transmitted sub-frame n. A HARQpostamble may include as POST for HS-DPCCH slot format 0 or POST/POSTfor HS-DPCCH slot format 1. POST/POST may indicate that POST istransmitted on a first half of the time slot allocated to HARQ-ACK, andPOST is transmitted on a second half of the time slot allocated toHARQ-ACK in a subframe. For example, a HARQ postamble may be transmittedin sub-frame n+2×N_acknack_transmit−2 unless ACK or NACK or PRE orPRE/PRE or any combination of ACK and NACK is to be transmitted in thissub-frame. For example, a HARQ postamble may be transmitted in sub-framen+2ΔN_acknack_transmit−2, when HARQ is transmitted a feedback group istransmitted sub-frame n and parameter N_acknack_transmit is greaterthan 1. For example, a POST/POST may be transmitted in a subframe whenthe HARQ-ACK messages for the serving cells are to be DTX'd. The WTRUmay transmit an HARQ postamble POST/POST in a slot allocated to HARQ-ACKin a subframe, when a DTX codeword is to be transmitted in the subframefor each of the configured serving cells.

FIG. 10 illustrates example transmitted signal with PREs/POSTs beingfilled. As shown, PRE/PRE may be transmitted in subframe n−1. PRE forthe first feedback group may be transmitted in the first half slot 1010of subframe n−1, and PRE for the second feedback group may betransmitted in the second half slot 1020 of subframe n−1. POST for thefirst feedback group may be transmitted in the first half slot 1030 ofsub-frame n+2×N_acknack_transmit−2 such as subframe n+9, and POST forthe second feedback group may be transmitted in the second half slot1040 of sub-frame n+2×N_acknack_transmit−2 such as subframe n+9.

The duration of sub-frames over which discontinuous transmission (DTX)detection can be avoided may be determined. The duration may bedetermined based on, for example, the location of HARQ preamble such asPRE/PRE and postamble such as POST/POST. As shown in FIG. 10, DTXdetection can be avoided between a PRE/PRE and a POST/POST. Detectionreliability of PRE and POST at Node B receiver may be improved due torepetition transmission over multiple such as two HARQ-ACK messages.

In an embodiment, PRE/POST may be transmitted on the first HARQ-ACKmessage. The PRE/POST may be restricted to transmit on a portion of atime slot, such as the first or the second half slot, which may carrythe ACK/NACK information for the primary cell. In the remaining portionof the time slot, such as the other half slot, DCW may be transmitted.

FIG. 11 illustrates another example transmitted signal with PREs/POSTsbeing filled. As shown, PRE may be transmitted on the first half slot1110 of subframe n−1, and DTX codeword (DCW) may be transmitted in thesecond half slot 1120 of subframe n−1. For example, a DCW may betransmitted when one of the feedback codewords is DTXed. The WTRU maytransmit DCW when the WTRU has not detected data on the cells/carriersassociated with the codeword. For example, DTX may be transmitted whenall the feedback codewords are DTXed. POST for the first feedback groupmay be transmitted in the first half slot 1130 of sub-framen+2×N_acknack_transmit−2 such as subframe n+9, and DCW may betransmitted in the second half slot 1140 of subframe n+9. As shown inFIG. 11, DTX detection may not be needed between a PRE/DCW and aPOST/DCW.

In an embodiment, the CQI or composite PCI/CQI for a feedback group maynot be transmitted during a compressed mode gap. For example, if part ofthe uplink gap overlaps part of the slot that carries a PCI/CQIinformation report on the HS-DPCCH for a feedback group during acompressed mode gap, the PCI/CQI report over that time slot may not betransmitted. The PCI/CQI information report for the feedback group maybe DTXed. In the same subframe, if another time slot that carriesPCI/CQI report for a second feedback group does not overlap with theuplink gap, the PCI/CQI report for the second feedback group may betransmitted. In an embodiment, if part of the uplink gap overlaps partof the slot that carries a PCI/CQI information report on the HS-DPCCHfor a feedback group during a compressed mode gap, the PCI/CQI reportover that subframe may not be transmitted.

For example, during compressed mode on the associated Dedicated PhysicalChannel (DPCH) or Fractional Dedicated Physical Channel (F-DPCH), thefollowing applies for the WTRU for transmission of HS-DPCCH andreception of HS-SCCH and HS-PDSCH. If in a HS-DPCCH subframe a part of aslot allocated for CQI information overlaps with an uplink transmissiongap on the associated DPCH, the WTRU may not transmit the CQI orcomposite PCI/CQI information in that slot if HS-DPCCH slot format 1shown in Table 1 is used. For example, if HS-DPCCH slot format 0 shownin Table 1 is used, the WTRU may not transmit the CQI or compositePCI/CQI information in that subframe.

For example, if the WTRU is configured with more than two secondaryserving HS-DSCH cells and if in a HS-DPCCH sub-frame a part of the slotallocated for CQI information overlaps with an uplink transmission gapon the associated DPCH, the WTRU may not transmit CQI or compositePCI/CQI information in that time slot. For example, if the WTRU isconfigured with less than two secondary serving HS-DSCH cells and if ina HS-DPCCH sub-frame a part of the slots allocated for CQI informationoverlaps with an uplink transmission gap on the associated DPCH, theWTRU may not transmit CQI or composite PCI/CQI information in thatsub-frame.

Table 5.1 illustrates example downlink configurations for the HS-DPCCHfeedback. Table 5.1 is presented in order in terms of the total numberof transport blocks to be transmitted. As shown, the size of the tablegrows exponentially as a function of the number of transport blocks.

TABLE 5.1 Number of Number of Number of ACK/NACK Configuration transportHSDPA carriers codebook size Max CQI/PCI size case # blocks Carrierswith MIMO (number of codes) (bits) 1 3 3 0 3 × 3 × 3 − 1 = 26     5 +5 + 5 = 15 2 4 3 1 3 × 3 × 7 − 1 = 62    5 + 5 + 10 = 20 3 4 4 0 3 × 3 ×3 × 3 − 1 = 80     5 + 5 + 5 + 5 = 20 4 5 3 2  3 × 7 × 7 − 1 = 146   5 + 10 + 10 = 25 5 5 4 1 3 × 3 × 3 × 7 − 1 = 188    5 + 5 + 5 + 10 =25 6 6 3 3  7 × 7 × 7 − 1 = 342   10 + 10 + 10 = 30 7 6 4 2 3 × 3 × 7 ×7 − 1 = 440   5 + 5 + 10 + 10 = 30 8 7 4 3 3 × 7 × 7 × 7 − 1 = 1028  5 + 10 + 10 + 10 = 35 

The HS-DPCCH frame format may be split via interleaved splitting asshown in FIG. 14. The feedback channels may be split by interleaving thebits. The 60 total bits of the HS-DPCCH with spreading factor 128 may beevenly divided into blocks of N bits, and the two feedback channels maythen be allocated in an interleaved fashion. In this approach, theHARQ-ACK/NACK field of the two HS-DPCCHs may be mapped to feedbackchannel 1 and feedback channel 2 symbols during the first time slot, andthe CQI/PCI for the HS-DPCCHs may be mapped to channel 1 and channel 2in the second and third time slots, respectively.

In an embodiment, total number of 60 bits of the HS-DPCCH may beunevenly divided into multiple blocks. An example interleaved splittingis shown in FIG. 15. Here the size of each block may be pre-defined,signaled, or the uneven pattern may be periodic, such as, per slot.Optionally the uneven pattern may not be periodic.

The HS-DPCCH frame format may be split using hybrid methods. TheHARQ-ACK/NACK and CQI/PCI fields may be split using the differentimplementations described above. For example, the HARQ-ACK/NACK fieldmay be transmitted in accordance with the per-timeslot splitimplementation and the CQI/PCI field may be transmitted in accordancewith the interleaving split implementation. FIG. 16 shows a mixed use ofthe described splitting implementations for HARQ-ACK and CQI/PCI fields.Another example implementation is shown in FIG. 17, where the HARQ-ACKfield uses the interleaving split implementation and the CQI/PCI fielduses the per-field implementation.

FIG. 18 shows an example HS-DPCCH layout for 3 carriers without MIMO. Inan example, three carriers may be configured simultaneously for downlinkdata transmission and none of the carriers may be configured with MIMO.As shown in FIG. 18, the feedback of two carriers may be combined andtransmitted in a feedback channel such as HS-DPCCH1 and the thirdcarrier may be allocated to another feedback channel such as HS-DPCCH2.For example, feedback information may be transmitted for every carrieron every subframe. The CQI feedback cycle may equal to 1 subframe, e.g.,2 ms.

FIG. 19 shows an example HS-DPCCH layout for 3 carriers without MIMOwith redundancy. With redundancy, the feedback information for a certaincarrier may be transmitted on more than one feedback channels.

The feedback slot or resource for carrier C1 may be associated with theserving HS-DSCH cell, while the feedback slots for carrier C2 andcarrier C3 may be associated with the secondary serving HS-DSCH cells inthe order by which they are listed in the configuration message obtainedby higher layers (RRC signaling).

In an embodiment, the CQI/PCI field may be arranged in a time divisionmultiplexing (TDM) fashion as shown in FIG. 20. The feedbacks from thetwo carriers may be coded independently by a (20,5) Reed Miller code andmay be mapped in multiple, for example consecutive, sub-frames. The CQIfeedback cycle may be 2 sub-frames. In an embodiment, the CQI report forcarrier C3 may not transmitted in the second sub-frame. In anembodiment, the CQI report for C3 may be repeated in the secondsub-frame.

FIG. 21 shows an example HS-DPCCH layout for 3 carriers with one carrierconfigured in MIMO mode. For example, three carriers may be configuredsimultaneously for downlink data transmission, and one carrier may beconfigured with MIMO. For example, carrier C3 may be the MIMO carrier.The feedback slot for carrier C1 may be associated to the servingHS-DSCH cell, and the feedback slots for carrier C2 and carrier C3 maybe associated to the secondary serving HS-DSCH cells for which MIMO isnot configured and for which MIMO may be configured, respectively.

FIG. 22 shows an example HS-DPCCH layout with balanced loading for 3carriers with two MIMO carriers. For example, three carriers may beconfigured simultaneously for downlink data transmission, with MIMOconfigured in two carriers. For example, carrier C2 and carrier C3 maybe the MIMO carriers.

FIG. 23 shows an example HS-DPCCH layout with unbalanced loading for 3carriers with two MIMO carriers.

FIG. 24 shows an example HS-DPCCH layout with redundant loading for 3carriers with two MIMO carriers. Carrier C1 may be associated to theserving HS-DSCH cell whereas carrier C2 and carrier C3 may be associatedto the secondary serving HS-DSCH in the order by which they areconfigured. The order may be indicated, e.g., in the radio resourcecontrol (RRC) message.

FIG. 25 shows an example HS-DPCCH layout for 3 carriers configured inMIMO. For example, three carriers may be configured simultaneously fordownlink data transmission, and the three carriers may be configured inMIMO.

FIG. 26 shows an example HS-DPCCH layout with redundant loading for 3carriers with all configured in MIMO with spread factor of 128. Asshown, the two feedback channels/or groups are marked in differentshades, with light shade for feedback group 1 and dark shade forfeedback group 2.

FIG. 27 shows an example HS-DPCCH layout with redundant loading for 3carriers with all configured in MIMO. C1 may be associated with theserving HS-DSCH cell, whereas C2 and C3 may be associated with thesecondary serving HS-DSCH in the order by which they are configured(e.g., in the RRC message). Under the context that the spreading factoris set to 128 to include two feedback channels/groups, for example,taking the frame format as shown in FIG. 9, the carrier mapping for 3carriers with MIMO configured is shown in FIG. 27. As shown, the twofeedback channels/or groups are marked in different shades, with lightshade for feedback group 1 and dark shade for feedback group 2. Forexample, the minimum CQI feedback cycle may be 4 ms. CQI reporting forthe four carriers may not be completed in less than 2 sub-frames.

FIG. 28 shows an example HS-DPCCH layout for 4 carriers without MIMO.Four carriers may be configured and none of them may be configured withMIMO. Denote the four carriers as C1, C2, C3, and C4. For example, C1may be associated to the serving HS-DSCH cell, and C2, C3 and C4 may beassociated to the secondary serving HS-DSCH cells in the order by whichthey are configured, e.g., in the RRC message.

FIG. 29 shows an example HS-DPCCH layout for 4 carriers with one MIMOcarrier. Four carriers may be configured, and MIMO may be configuredwith one of the four carriers. For example, carrier C4 may be thecarrier configured with MIMO.

FIG. 30 shows an example HS-DPCCH layout for 4 carriers with one MIMOcarrier. For example, a coding rate of (20, 15) may be applied for typeA CQI or (20,12) for type B CQI. Denote this coding scheme as CQI(20,12/15). This coding scheme may reduce the CQI feedback cycle forminimizing the impact to downlink transmission. Carrier C1 may beassociated with the serving HS-DSCH cell, carrier C4 with the secondaryserving HS-DSCH cell which is configured in MIMO mode and carrier C2 andcarrier C3 may be associated with the other two secondary servingHS-DSCH cells, for example, in order by which they are configured in theRRC message. In an example, the serving HS-DSCH cell may be the oneconfigured with MIMO, the serving HS-DSCH cell may be associated with C4while C1, C2, and C3 may be associated with the secondary servingHS-DSCH cells, for example, in order by which they are configured in theRRC message.

FIG. 31 shows an example HS-DPCCH layout with balanced loading for 4carriers with two carriers in MIMO. For example, carriers C3 and C4 maybe MIMO carriers.

FIG. 32 shows an example HS-DPCCH layout with unbalanced loading for 4carriers with two carriers in MIMO.

FIG. 33 shows an example HS-DPCCH layout with unbalanced loading for 4carriers with two carriers in MIMO. As shown CQI feedback cycle may beequal for the carriers.

FIG. 34 shows an example HS-DPCCH layout for 4 carriers with twocarriers in MIMO with a single CQI feedback cycle. For example, a codingrate of (20, 15) may be applied for type A CQI or (20,12) for type BCQI. Denote this coding scheme as CQI(20, 12/15).

If the serving HS-DSCH cell is not configured in MIMO, then it may beassociated to C1 and C2 may be associated to the other HS-DSCH cell notconfigured in MIMO. C3 and C4 may be associated to the secondary servingHS-DSCH cells, for example, in order by which they are configured by thehigher layers. If the serving HS-DSCH cell is configured in MIMO mode,it may be associated with C3. C1 and C2 may then be associated to thefirst two secondary HS-DSCH cells not configured in MIMO (e.g., in orderby which they are configured) and C4 may be associated with thesecondary serving HS-DSCH cell configured in MIMO.

FIG. 35 shows an example HS-DPCCH layout for 4 carriers with threecarriers in MIMO. For example, C2, C3, C4 may be the MIMO carriers andC1 may be the non-MIMO carrier. In this case if the serving HS-DSCH cellis not configured in MIMO, it may be associated with C1. Carriers C2, C3and C4 may be associated to the secondary serving HS-DSCH cell, forexample, in order by which they are configured by the higher layers. Ifthe serving HS-DSCH cell is configured in MIMO mode, the serving HS-DSCHcell may be associated with C2. C1 may then be associated to thesecondary HS-DSCH cell not configured in MIMO mode. Carriers C3 and C4may be associated to the secondary serving HS-DSCH cells configured inMIMO, for example, in order by which they are configured in the RRCmessage.

FIG. 36 shows an example HS-DPCCH layout for 4 carriers with allcarriers in MIMO.

FIG. 37 shows an example HS-DPCCH layout for 4 carriers with allcarriers in MIMO.

For example, the spreading factor is set to 128 to include two feedbackchannels. The frame format shown in FIG. 9, the carrier mapping for 4carriers with MIMO configured in all carriers may be illustrated in FIG.37. As shown, the two feedback channels/groups may be marked indifferent shades, with the light shade for feedback channel 1 and darkshade for feedback channel 2, for example. For example, CQI reportingfor the four carriers may not be completed in less than 2 sub-frames.The minimum CQI feedback cycle may be 4 ms.

Although the feedback layouts disclosed in the above examples aredescribed under the context of dual channel/dual group format generatedby reducing the spreading factor, other mechanisms may be implemented togenerate the additional feedback channel(s) including, but not limitedto, using an additional channelization code to create the secondfeedback channel in the same uplink transmission; using two feedbackchannels over uplinks on two carriers; or using two feedback channelsover in phase and quadrature signals of the same uplink while using thesame channelization code. C1 may be associated with a serving highspeed-downlink shared channel (HS-DSCH) cell and carrier C2, C3, and C4may be associated with the secondary serving HS-DSCH cells in order bywhich they are configured by the higher layers or RRC signaling.

In an embodiment, legacy codebook codes may be reused. In an embodiment,a codeword for the discontinuous transmission (DTX) state, where theWTRU may not detect transport blocks from the carriers, may not exist inlegacy codebooks. The HARQ-ACK/NACK slot may be in DTX mode (DTX'd).

For example, a POST codeword may be transmitted to indicate DTX. TheHARQ-ACK slot may DTX'd if there is DTX for a full slot. For example,new codewords generated may be generated by combining two more legacycodebooks. For example, for a configuration such as case 8 shown inTable 5.1, there may be 1028 allowed states while the combination of twoRelease 9 DC-HSDPA MIMO codebooks may support up to 48×48=2304 differentcodewords. Combining legacy codebooks may reduce decoding complexity.

Some of the codewords may not be valid codewords for use in generating4C-HSDPA codewords. Using case 8 shown in Table 5.1 as an example, theRelease 9 codeword table may be split into multiple small tables asshown below. Table 6 shows a codebook mapping of HARQ-ACK when the WTRUis configured in MIMO mode and Secondary_Cell_Active is not 0. Tables6-14 show codeword mapping tables A-H. For a carrier-pair in which oneof the carriers is configured without MIMO, Tables E, G, H (or the otherway around Tables D, F, H) have a total of 28 entries that may includeinvalid codewords that may not participate in the coding for 4C-HSDPAbefore re-labeling them. In an embodiment, a subset of the 4C-HSDPAcodewords may not need re-labeling. For example, 48×(48−28)=960 4C-HSDPAcodewords may not be relabeled. In an embodiment, a subset of the4C-HSDPA codewords may be re-interpreted. For example, 1028−960=68codewords are needed by re-interpreting the meaning of the legacycodewords. Codewords for 4C-HSDPA may be constructed to indicate DTX byre-labeling some of the legacy codewords.

One of the benefits of identifying these unused codewords is that itsignificantly reduces decoding complexity if a design rule is definedsuch that both the base station and WTRU know the invalid codewords thatare common to both the base station and WTRU. This may be done bypreventing both the base station and WTRU from using a common set ofinvalid codewords. For example, in the example above with case 8 shownin Table 5.1, use of Tables E, G, H may be disallowed (after taking 684C-HSDPA code words based on them) at both the base station and WTRU.

TABLE 6 Number of detected Number of detected transport blocks transportblocks on one on the other serving HS-DSCH cell serving HS-DSCH cell 0 12 0 N/A B E 1 A C G 2 D F H

TABLE 7 A/D 1 1 1 1 1 1 1 1 1 1 N/D 0 0 0 0 0 0 0 0 0 0

TABLE 8 D/A 0 0 0 0 0 0 1 1 1 1 D/N 1 1 1 1 1 1 0 0 0 0

TABLE 9 A/A 1 1 0 1 0 0 0 0 1 1 A/N 0 0 1 1 1 0 1 0 0 1 N/A 1 0 0 1 0 11 1 0 0 N/N 0 1 1 0 0 1 0 1 0 1

TABLE 10 AA/D 1 0 1 0 1 1 1 1 0 1 AN/D 1 1 0 1 0 1 0 1 1 1 NA/D 0 1 1 11 0 1 0 1 1 NN/D 1 0 0 1 0 0 1 0 0 0

TABLE 11 D/AA 1 0 0 0 1 0 0 0 1 1 D/AN 0 1 0 0 0 0 1 1 0 1 D/NA 0 0 0 11 1 1 1 1 0 D/NN 1 1 1 1 1 0 0 1 0 0

TABLE 12 AA/A 0 1 1 0 0 0 0 1 0 0 AA/N 1 1 1 0 0 1 1 0 1 0 AN/A 1 0 1 11 0 0 1 1 0 AN/N 0 0 1 1 0 1 0 0 0 1 NA/A 0 1 0 1 1 1 1 1 0 0 NA/N 1 1 00 1 0 0 0 0 1 NN/A 0 0 0 0 1 1 0 0 1 0 NN/N 0 1 0 0 0 1 1 0 0 1

TABLE 13 A/AA 1 0 1 0 0 1 1 0 0 0 A/AN 1 0 0 1 0 1 0 1 0 1 A/NA 0 0 1 11 0 1 0 0 1 A/NN 0 1 1 1 0 1 0 0 1 1 N/AA 1 1 0 1 0 0 1 0 1 0 N/AN 1 1 00 0 1 0 1 1 0 N/NA 0 1 1 0 1 0 1 0 1 0 N/NN 0 0 1 0 1 1 0 1 0 1

TABLE 14 AA/AA 0 1 1 0 1 1 0 1 1 1 AA/AN 1 0 1 1 0 0 1 1 1 1 AA/NA 1 1 01 1 1 1 0 0 1 AA/NN 0 1 1 1 0 1 1 1 0 0 AN/AA 0 0 0 1 1 0 0 1 0 1 AN/AN1 1 1 0 0 0 0 0 0 1 AN/NA 1 0 0 0 0 1 0 1 0 0 AN/NN 0 0 1 1 0 1 0 0 0 1NA/AA 1 1 0 0 1 0 1 1 1 0 NA/AN 0 0 1 0 1 0 1 0 0 0 NA/NA 1 0 1 1 1 1 00 1 0 NA/NN 1 1 1 0 0 1 1 0 1 0 NN/AA 0 1 0 1 0 0 0 0 1 0 NN/AN 0 0 1 00 0 0 1 1 0 NN/NA 0 1 0 0 1 1 0 0 0 0 NN/NN 0 0 0 0 0 1 1 0 1 1

FIG. 38 shows an example coding flow where none of the active HS-DSCHcells is configured in MIMO mode. Channel coding may be performed inparallel or sequentially. The feedback information may be separatelycoded and may be time-multiplexed. For example, if a single HS-DSCH cellis allocated to a given feedback channel/group, the total number of CQIinformation bits may be 5. If two HS-DSCH cells are allocated to a givenfeedback channel/group, the total number of CQI information bits may be10 bits. After the channel coding, both HARQ-ACK and CQI data from firstand secondary feedback channels may be multiplexed and fed into thephysical channel mapping function respectively.

In an example, a feedback channel may carry the feedback information forat least one HS-DSCH cell that may be configured in MIMO mode, themeasurement indication on that feedback channel may include precodingcontrol indication (PCI) and channel quality indication (CQI). Anexample coding flow when both feedback channels include at least oneHS-DSCH cell that in MIMO mode is shown in FIG. 39. FIG. 40 shows anexample coding flow where one feedback channel supports the HS-DSCHcells that are configured in MIMO mode.

In an embodiment, multiplexing may not be included. For example, theillustrated multiplexing block or entity show in FIGS. 38-40 may not beincluded, if the physical channel mapping block or entity ensures thatproper channel mapping is performed. FIG. 41 illustrates themultiplexing-less equivalent structure for the case illustrated in FIG.33. The same approach may be used for the other cases illustrated inFIGS. 38-40.

Channel coding for each individual feedback channel may be performedindependently. Channel coding may reuse the same encoding schemes asspecified in the standards specifications (see 3GPP TS 25.212 v9.0.0,“Multiplexing and Channel Coding (FDD)”) (3GPP TS 25.212), which isincorporated by reference herein), respectively, for the different casesspecified herein.

Tables 15-17 show example channel coding schemes. In Table 15-17,channel coding case “A” may indicate that, when the feedback channelcarries the feedback information for a single HS-DSCH cell which is notconfigured in MIMO mode, the channel coding may be performed accordingto subclause 4.7.2 of 3GPP TS 25.212. Channel coding case “B” mayindicate that, when the feedback channel carries the feedbackinformation for a single HS-DSCH cell configured in MIMO mode, thechannel coding may be performed according to subclause 4.7.3 of 3GPP TS25.212. Channel coding case “C” may indicate that, when the feedbackchannel carries the feedback information for dual HS-DSCH cells withnone configured in MIMO mode, the channel coding may be performedaccording to subclause 4.7.3A of 3GPP TS 25.212. Channel coding case “D”may indicate that, when the feedback channel carries the feedbackinformation for dual HS-DSCH cells with at least one being configured inMIMO mode, the channel coding may be performed according to subclause4.7.3B of 3GPP TS 25.212.

The channel coding schemes used in the feedback channels may beassociated with a specific configuration of the multiple celltransmission according to Table 15 if the balanced design principledescribed herein is applied.

TABLE 15 Number of cells Channel coding Channel coding Configurationconfigured case for 1^(st) case for 2^(nd) case # Num_of_ Active_Cellsin MIMO mode feedback channel feedback channel 1 3 0 C A 2 3 1 C B 3 4 0C C 4 3 2 D B 5 4 1 D C 6 3 3 D B 7 4 2 D D 8 4 3 D D 9 4 4 D D

The channel coding schemes used in the feedback channels may beassociated to a specific configuration of the multiple cell transmissionaccording to Table 16 if the unbalanced design principle describedherein is applied.

TABLE 16 Number of cells Channel coding Channel coding Configurationconfigured case for 1^(st) case for 2^(nd) case # Num_of_Active_Cells inMIMO mode feedback channel feedback channel 1 3 0 C A 2 3 1 D A 3 4 0 CC 4 3 2 D A 5 4 1 D C 6 3 3 D B 7 4 2 D C 8 4 3 D D 9 4 4 D D

The coding schemes from previous standard releases may be used. Forexample, a coding scheme may be used for the configuration cases wherenone of the carriers in the feedback channel are configured in MIMOmode, and a coding scheme may be used for configuration cases where atleast one carrier in the feedback channel is configured in MIMO mode. Ifthe actual number of codewords in some configurations is smaller thanthat in the codebook used, the Node-B may consider to decode a subset ofthe codebook for better decoding performance. Example use of the twocoding schemes is shown in Table 17. Note that there is no differencebetween the feedback channels due to their labels, and therefore theyare interchangeable on any row when associating them with the codingschemes. Table 17 may be applied to HARQ-ACK codebook if the CQI/PCIcoding scheme takes another form of encoding. Table 17 shows channelcoding schemes associated with the cell configurations by using twocodebooks.

TABLE 17 Number of cells Channel coding Channel coding Configurationconfigured case for 1^(st) case for 2^(nd) case # Num_of_Active_Cells inMIMO mode feedback channel feedback channel 1 3 0 C C 2 3 1 D C 3 4 0 CC 4 3 2 D C 5 4 1 D C 6 3 3 D D 7 4 2 D C 8 4 3 D D 9 4 4 D D

In an embodiment, power offset may be determined for the HARQ ACK slot.For a 4C-HSDPA system where three or four carriers are activated, poweroffsetting for HS-DPCCH1 and HS-DPCCH2 HARQ ACK slot may follow therules shown in Table 18. Power offset setting may depend on the ACK/NACKcodebooks used in HS-DPCCH1 and HS-DPCCH2.

For example, power offset setting rules shown in Table 18 may be appliedto determine power offset Ahs1 for HS-DPCCH1 HARQ ACK slot. The rules inTable 18 may be applied to determine power offset Ahs2 for HS-DPCCH2HARQ ACK slot. The power offset Ahs=max (Ahs1, Ahs2) may be determined.The WTRU may apply Ahs to HS-DPCCH HARQ ACK slot that may be aconcatenation of HS-DPCCH1 and HS-DPCCH2 for SPREADING FACTOR 128. TheWTRU may apply Ahs to HS-DPCCH HARQ ACK slot that may be a superpositionof HS-DPCCH1 and HS-DPCCH2 for SF256. In an embodiment, different poweroffsets may be applied independently to the two feedback channels.

Power offset rules may be applied independently to the two HARQ-ACKcodewords or the HARQ-ACK of HS-DPCCH1 and HS-DPCCH2. The maximum poweroffset of the two may be used for transmission in the timeslot. Therules in Tables 18 and 19 are the example rules for setting the poweroffset of the HARQ-ACK field in the HS-DPCCH. This may prevent the WTRUfrom changing transmission power at the half slot, in the case twodifferent power offset would be used for the first and second HARQ-ACKcodeword (or the HARQ-ACK of HS-DPCCH1 and HS-DPCCH2).

In an embodiment, the power offset setting may be dynamically adjusted.For example, the use of the rules may be based upon the carrieractivation/deactivation. The power offset setting may be selected basedon the MIMO configuration status of the active cells associated with afeedback channel. For example, when one carrier with MIMO is deactivatedin a feedback channel, and the remaining carrier in the same feedbackchannel is not configured with MIMO, the power offset setting of thisfeedback channel may be altered to a lower value regardless of whetherthe other carriers at the WTRU are configured in MIMO mode or not. Usingthe maximum value as a common setting may avoid abrupt power change inthe middle of a time slot.

TABLE 18 # of activated HARQ ACK # of carriers Codebook of Rule applyingCodebook of Rule applying activated with MIMO HS-DPCCH2 to HS-DPCCH2HS-DPCCH1 to HS-DPCCH1 carriers configured ACK slot ACK slot ACK slotACK slot 1 0 SC 1B SC 1B 1 SC-MIMO 1B SC-MIMO 1B 2 0 DC 2B DC 2B 1Dc-MIMO 3B DC-MIMO 3B 2 DC-MIMO 3B DC-MIMO 3B 3 0 SC 1A DC 2A 1 SC MIMO1A DC 2A SC 1A DC-MIMO 3A 2 SC 1A DC-MIMO 3A SC-MIMO 1A DC-MIMO 3A 3SC-MIMO 1A DC-MIMO 3A 4 0 DC 2A DC 2A 1 DC 2A DC-MIMO 3A DC-MIMO 3A DC2A 2 DC 2A DC-MIMO 3A DC-MIMO 3A DC-MIMO 3A DC-MIMO 3A DC 2A 3 DC-MIMO3A DC-MIMO 3A 4 DC-MIMO 3A DC-MIMO 3A

In Table 18, rules for 1A, 2A, and 3A are specified in Table 19, andrules for 1B, 2B, 3B are specified in Table 20.

In an embodiment, the feedback information from first feedbackchannel/group may be duplicated to second feedback channel if one or twocarriers are activated. Less power may be required to maintain the samelevel of HS-DPCCH transmission reliability.

In one embodiment, the rules in Table 18 may be used when the WTRU isconfigured to repeat the HARQ-ACK over the two half-slots. This mayhappen, for example, when the WTRU has one or two activated cells, orzero or one secondary serving HS-DSCH cell. The power offset may bereduced by 1 step down in the quantization table. The step down maycompensate for the use of repetition that may require less transmissionpower from the WTRU side.

TABLE 19 Rule Cases applied to Description Rule 1A non-MIMO A_(hs) mayequal the quantized amplitude ratio translated from single carrier thesignalled value Δ_(ACK) if the corresponding HARQ-ACK (SC) WTRUs,message is ACK; MIMO SC A_(hs) may equal the quantized amplitude ratiotranslated from WTRUs the signalled value Δ_(NACK) if the correspondingHARQ-ACK message is NACK; A_(hs) may equal the quantized amplitude ratiotranslated from the greatest of the signalled values Δ_(ACK) andΔ_(NACK) if the corresponding HARQ-ACK message is PRE before a singletransport block or POST after a single transport block. A_(hs) may equalthe quantized amplitude ratio translated from the signalled valueΔ_(ACK) + 1 if the corresponding HARQ-ACK message is ACK/ACK; A_(hs) mayequal the quantized amplitude ratio translated from the signalled valueΔ_(NACK) + 1 if the corresponding HARQ-ACK message is NACK/NACK; A_(hs)may equal the quantized amplitude ratio translated from the greatest of(Δ_(ACK) + 1) and (Δ_(NACK) + 1) if the corresponding HARQ-ACK messageis ACK/NACK, NACK/ACK, PRE before a dual transport block or POST after adual transport block. Rule 2A non-MIMO dual A_(hs) may equal thequantized amplitude ratio translated from carrier (DC) the signalledvalue Δ_(ACK) + 1 if the corresponding HARQ-ACK WTRUs message containsat least one ACK but no NACK; A_(hs) may equal the quantized amplituderatio translated from the signalled value Δ_(NACK) + 1 if thecorresponding HARQ-ACK message contains at least one NACK but no ACK;A_(hs) may equal the quantized amplitude ratio translated from thegreatest of (Δ_(ACK) + 1) and (Δ_(NACK) + 1) if the correspondingHARQ-ACK message contains both ACK and NACK, or is a PRE or a POST. Rule3A MIMO DC A_(hs) may equal the quantized amplitude ratio translatedfrom WTRUs the signalled value Δ_(ACK) + 1 if the corresponding HARQ-ACKmessage contains at least one ACK but no NACK; A_(hs) may equal thequantized amplitude ratio translated from the signalled value Δ_(NACK) +1 if the corresponding HARQ-ACK message contains at least one NACK butno ACK; A_(hs) may equal the quantized amplitude ratio translated fromthe greatest of (Δ_(ACK) + 1) and (Δ_(NACK) + 1) if the correspondingHARQ-ACK message contains both ACK and NACK, or is a PRE or a POST.

TABLE 20 Rule Cases applied to Description Rule 1B non-MIMO A_(hs) mayequal the quantized amplitude ratio translated from single carrier thesignalled value Δ_(ACK) − 1 if the corresponding HARQ-ACK (SC) UEs,message is ACK; MIMO SC UEs A_(hs) may equal the quantized amplituderatio translated from the signalled value Δ_(NACK) − 1 if thecorresponding HARQ-ACK message is NACK; A_(hs) may equal the quantizedamplitude ratio translated from the greatest of the signalled valuesΔ_(ACK) − 1 and Δ_(NACK) − 1 if the corresponding HARQ-ACK message isPRE before a single transport block or POST after a single transportblock. A_(hs) may equal the quantized amplitude ratio translated fromthe signalled value Δ_(ACK) if the corresponding HARQ-ACK message isACK/ACK; A_(hs) may equal the quantized amplitude ratio translated fromthe signalled value Δ_(NACK) if the corresponding HARQ-ACK message isNACK/NACK; A_(hs) may equal the quantized amplitude ratio translatedfrom the greatest of Δ_(ACK) and Δ_(NACK) if the corresponding HARQ-ACKmessage is ACK/NACK, NACK/ACK, PRE before a dual transport block or POSTafter a dual transport block. Rule 2B non-MIMO dual A_(hs) may equal thequantized amplitude ratio translated from carrier (DC) UEs the signalledvalue Δ_(ACK) if the corresponding HARQ-ACK message contains at leastone ACK but no NACK; A_(hs) may equal the quantized amplitude ratiotranslated from the signalled value Δ_(NACK) if the correspondingHARQ-ACK message contains at least one NACK but no ACK; A_(hs) may equalthe quantized amplitude ratio translated from the greatest of Δ_(ACK)and Δ_(NACK) if the corresponding HARQ-ACK message contains both ACK andNACK, or is a PRE or a POST. Rule 3B MIMO DC UEs A_(hs) may equal thequantized amplitude ratio translated from the signalled value Δ_(ACK) ifthe corresponding HARQ-ACK message contains at least one ACK but noNACK; A_(hs) may equal the quantized amplitude ratio translated from thesignalled value Δ_(NACK) if the corresponding HARQ-ACK message containsat least one NACK but no ACK; A_(hs) may equal the quantized amplituderatio translated from the greatest of Δ_(ACK) and Δ_(NACK) if thecorresponding HARQ-ACK message contains both ACK and NACK, or is a PREor a POST.

Rules 1B, 2B, and 3B may be derived by adjusting a fixed amount of power(for example reducing 3 dB) from the A_(hs) after it is calculated from1A, 2A, 3A respectively in Table 19 with corresponding conditions.

When the WTRU is configured to apply repetition, the rules 1B, 2B and 3Bmay be implemented by reducing the resulting A_(hs) by 3 dB, or by afixed number of steps down from the quantization table. For example, ifthe WTRU has less than 2 secondary serving HS-DSCH cell active, thenA_(hs) may be reduced by a fixed value which could be a fixed X dB(e.g., 3 dB), or by deriving the value from N (e.g., 1 or 2) step(s)down the quantization table.

In an embodiment, more than two cells may be activated. If the WTRU isnot configured in MIMO mode in any of the active cells in a feedbackchannel/group, then the power offset setting for HARQ-ACK associatedwith a feedback group that supports two active cells may be calculatedaccording to rule 2A, and the power offset setting for HARQ-ACKassociated with a feedback group that supports one active cell may becalculated according to rule 1A. If the WTRU is configured in MIMO modein any one of the cells in a group, the power offset setting forHARQ-ACK associated with a feedback group that supports two active cellsmay be calculated according to rule 3A, and the power offset setting forHARQ-ACK associated with a feedback group that supports one active cellmay be calculated according to rule 1A.

In an embodiment, two or less than two cells may be activated. If theWTRU is not configured in MIMO mode in any of the active cells in afeedback channel/group, the power offset setting for HARQ-ACK associatedwith a feedback group that supports two active cells may be calculatedaccording to rule 2B, and the power offset setting for HARQ-ACKassociated with a feedback group that supports one active cell may becalculated according to rule 1B. If there is two and less than two cellsthat are activated, and the WTRU is configured in MIMO mode in any oneof the cells in a group then the power offset setting for HARQ-ACKassociated with a feedback group that supports two active cells may becalculated according to rule 3B, and the power offset setting forHARQ-ACK associated with a feedback group that supports one active cellmay be calculated according to rule 1B.

A common setting for the two feedback channels may be calculated. Forexample, the maximum power offset value of two feedback channels may beapplied to the time slot allocated to HARQ-ACK transmission (e.g. the1st slot in a sub-frame as shown FIG. 9). The maximum value may becalculated on a per sub-frame basis. The maximum value may bepre-calculated with a set of valued store in a table. This set of powersetting values can be applied by means of table lookup to the HARQ-ACKslot.

For example, HARQ ACK power offset may be determined as follows. For thefeedback group that includes the primary carrier/serving cell, denoteA_(hs1) as the A_(hs) value for the HS-DPCCH slots carrying HARQAcknowledgement. If Secondary_Cell_Active is 0, A_(hs1) may equal thequantized amplitude ratio translated from the signaled value A_(ACK) ifthe corresponding HARQ-ACK message is ACK; A_(hs1) may equal thequantized amplitude ratio translated from the signaled value Δ_(NACK) ifthe corresponding HARQ-ACK message is NACK; A_(hs1) may equal thequantized amplitude ratio translated from the greatest of the signaledvalues Δ_(ACK) and Δ_(NACK) if the corresponding HARQ-ACK message is PREbefore a single transport block or POST after a single transport block.A_(hs1) may equal the quantized amplitude ratio translated from thesignaled value Δ_(ACK)+1 if the corresponding HARQ-ACK message isACK/ACK; A_(hs1) may equal the quantized amplitude ratio translated fromthe signaled value Δ_(NACK)+1 if the corresponding HARQ-ACK message isNACK/NACK; A_(hs1) may equal the quantized amplitude ratio translatedfrom the greatest of (Δ_(ACK)+1) and Δ_(NACK)+1) if the correspondingHARQ-ACK message is ACK/NACK, NACK/ACK, PRE before a dual transportblock or POST after a dual transport block.

If Secondary_Cell1_Active is not 0, and if the WTRU is not configured inMIMO mode, A_(hs1) may equal the quantized amplitude ratio translatedfrom the signalled value Δ_(ACK)+1 if the corresponding HARQ-ACK messagecontains at least one ACK but no NACK; A_(hs1) may equal the quantizedamplitude ratio translated from the signalled value Δ_(NACK)+1 if thecorresponding HARQ-ACK message contains at least one NACK but no ACK;A_(hs1) may equal the quantized amplitude ratio translated from thegreatest of (Δ_(ACK)+1) and (Δ_(NACK)+1) if the corresponding HARQ-ACKmessage contains both ACK and NACK, or is a PRE or a POST.

If Secondary_Cell1_Active is not 0, and if the WTRU is configured inMIMO mode, A_(hs1) may equal the quantized amplitude ratio translatedfrom the signalled value Δ_(ACK)+1 if the corresponding HARQ-ACK messagecontains at least one ACK but no NACK; A_(hs1) may equal the quantizedamplitude ratio translated from the signalled value Δ_(NACK)+1 if thecorresponding HARQ-ACK message contains at least one NACK but no ACK;A_(hs1) may equal the quantized amplitude ratio translated from thegreatest of (Δ_(ACK)+1) and (Δ_(NACK)+1) if the corresponding HARQ-ACKmessage contains both ACK and NACK, or is a PRE or a POST.

For the feedback group that does not include the primary carrier/servingcell, denote A_(hs2) as the A_(hs) value for the HS-DPCCH slots carryingHARQ Acknowledgement. If Secondary_Cell2_Active orSecondary_Cell3_Active is 0, A_(hs2) may equal the quantized amplituderatio translated from the signaled value Δ_(ACK) if the correspondingHARQ-ACK message is ACK; A_(hs2) may equal the quantized amplitude ratiotranslated from the signaled value Δ_(NACK) if the correspondingHARQ-ACK message is NACK; A_(hs2) may equal the quantized amplituderatio translated from the greatest of the signaled values Δ_(ACK) andΔ_(NACK) if the corresponding HARQ-ACK message is PRE before a singletransport block or POST after a single transport block. A_(hs2) mayequal the quantized amplitude ratio translated from the signaled valueΔ_(ACK)+1 if the corresponding HARQ-ACK message is ACK/ACK; A_(hs2) mayequal the quantized amplitude ratio translated from the signaled valueΔ_(NACK)+1 if the corresponding HARQ-ACK message is NACK/NACK; A_(hs2)may equal the quantized amplitude ratio translated from the greatest of(Δ_(ACK)+1) and (Δ_(NACK)+1) if the corresponding HARQ-ACK message isACK/NACK, NACK/ACK, PRE before a dual transport block or POST after adual transport block.

If Secondary_Cell2_Active or Secondary_Cell3_Active is not 0, and if theWTRU is not configured in MIMO mode, A_(hs2) may equal the quantizedamplitude ratio translated from the signalled value Δ_(ACK)+1 if thecorresponding HARQ-ACK message contains at least one ACK but no NACK;A_(hs2) may equal the quantized amplitude ratio translated from thesignalled value Δ_(NACK)+1 if the corresponding HARQ-ACK messagecontains at least one NACK but no ACK; A_(hs2) may equal the quantizedamplitude ratio translated from the greatest of (Δ_(ACK)+1) and(Δ_(NACK)+1) if the corresponding HARQ-ACK message contains both ACK andNACK, or is a PRE or a POST.

If Secondary_Cell2_Active or Secondary_Cell3_Active is not 0, and if theWTRU is configured in MIMO mode, A_(hs2) may equal the quantizedamplitude ratio translated from the signalled value Δ_(ACK)+1 if thecorresponding HARQ-ACK message contains at least one ACK but no NACK;A_(hs2) may equal the quantized amplitude ratio translated from thesignalled value Δ_(NACK)+1 if the corresponding HARQ-ACK messagecontains at least one NACK but no ACK; A_(hs2) may equal the quantizedamplitude ratio translated from the greatest of (Δ_(ACK)+1) and(Δ_(NACK)+1) if the corresponding HARQ-ACK message contains both ACK andNACK, or is a PRE or a POST.

In an embodiment, A_(hs) may equal the greatest of the calculated valuesA_(hs1) and A_(hs2).

In an embodiment, power offset setting HARQ ACK may be based onsimulation results. In 4C-HSDPA, different HS-DPCCH channel formats maybe used based on the number of carriers configured/activated at theWTRU. The power offset may be dependent on the number of carriers thathave MIMO configured. To evaluate the power offset for HARQ ACK,misdetection probability for a specific false alarm target which may beon per stream basis denoted as Pe_str, or on per codeword basis denotedas Pe_cw, and RLC retransmission probability denoted as Pr_RLC are usedas metrics, the performance target for Pe_str, Pe_cw and Pr_RLC arerespectively 1%, 1% and 0.01% when designing the power offset rules forHARQ-ACK.

As different configuration such as the number of carriers activated andthe number of carriers that have MIMO configured, the max power offsetrequired to respectively maintain the performance target for theaccording codebooks are obtained with the simulation running in additivewhite Gaussian noise (AWGN) channel and summarized in Table 21. Thespecific false alarm targets used in simulations are respectively 0.01and 0.1. Table 21 shows max power offset simulation results.

TABLE 21 P_fa = 0.01 P_fa = 0.1 Secondary_Cell_Active conditions Pe_strPe_cw Pr_RLC Pe_str Pe_cw Pr_RLC 0 0.41 0.41 0 0.62 0.64 0.86 1 1.29 1.31.86 2.01 2.09 3.02 2 Secondary_Cell_Enabled = 1.31 1.32 2.34 2.06 2.143.24 2 and WTRU is not configured in MIMO mode 2 Otherwise 2.32 2.395.87 3.96 4 5.9 3 2.71 2.91 6.25 4.23 4.55 6.26

The HS-DPCCH power settings for HS-DPCCH slots carrying HARQAcknowledgement may be determined based on the simulation results inTable 21. Power offset setting schemes are described below for HARQ ACKfield when Secondary_cell_Active is bigger than 1, e.g., for a 4C-HSDPAsystem where three or four carriers are activated. As shown in Table 21,the max power offset required for Pe_str and Pe_cw are similar.

In an embodiment, the power offset rule may be determined for HARQ-ACKbased on per-stream, Pe_str. For example, the HS-DPCCH channel may carryfeedback for multiple DL data streams in 4C-HSDPA, e.g., when 4 carriersare configured with MIMO and the number of stream is 8, the performancetarget may be met for the streams together.

In an embodiment, HARQ-ACK power offset setting schemes may be based onP_fa=0.01. In an example, the probability of false alarm P_fa=0.01 andperformance target Pe_str=1%. To guarantee the HARQ-ACK performance forpossible scenario including the worst case scenario which requires mostpower, the HARQ-ACK power offset may be set such that it is bigger thanthe required max power offset obtained by simulations, shown in Table22. Table 22 shows example power offset setting schemes where HARQ-ACKpower offset setting when Secondary_Cell_Active is bigger than 1.

TABLE 22 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, 2and WTRU is not Δ_(NACK) + 2) configured in MIMO mode 2 OtherwiseΔ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, Δ_(NACK) + 2) 3 Δ_(ACK) + 2Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, Δ_(NACK) + 2)

In an embodiment, HARQ-ACK power offset setting schemes may be based onprobability of false alarm P_fa=0.01 and performance target Pe_str=1%.Table 23 shows example power offset setting schemes whereSecondary_Cell_Active is bigger than 1. The HARQ-ACK power offsetsetting may be chosen to be close enough to the required max poweroffset obtained by simulations.

TABLE 23 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 1 Δ_(NACK) + 1 MAX(Δ_(ACK) + 1, 2and WTRU is not Δ_(NACK) + 1) configured in MIMO mode 2 Otherwise Δ_(ACK) + 2*  Δ_(NACK) + 2* MAX(Δ_(ACK) + 2*, Δ_(NACK) + 2*) 3Δ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, Δ_(NACK) + 2) Notes: *denotesthat power offset setting could be +1 instead of +2 to further reducethe interference at cost of performance degradation.

In an embodiment, HARQ-ACK power offset setting schemes may be based onprobability of false alarm P_fa=0.01 and performance targetPr_RLC=0.01%. Table 24 shows example power offset setting schemes whereSecondary_Cell_Active is bigger than 1. For example, HARQ-ACK poweroffset may be set such that the HARQ-ACK performance may be guaranteed.HARQ-ACK power offset may be set such that it is bigger than therequired max power offset obtained by simulations.

TABLE 24 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, 2and WTRU is not Δ_(NACK) + 2) configured in MIMO mode 2 OtherwiseΔ_(ACK) + 4 Δ_(NACK) + 4 MAX(Δ_(ACK) + 4, Δ_(NACK) + 4) 3 Δ_(ACK) + 4Δ_(NACK) + 4 MAX(Δ_(ACK) + 4, Δ_(NACK) + 4)

In an embodiment, HARQ-ACK power offset setting schemes may be based onprobability of false alarm P_fa=0.01 and performance targetPr_RLC=0.01%. Table 25 shows example power offset setting schemes whereSecondary_Cell_Active is bigger than 1. For example, HARQ-ACK poweroffset may be set such that the HARQ-ACK performance may be guaranteed,when the interference level may be increased. HARQ-ACK power offset maybe set such that it may be chosen to be close enough to the required maxpower offset obtained by simulations.

TABLE 25 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 1 Δ_(NACK) + 1 MAX(Δ_(ACK) + 1, 2and WTRU is not Δ_(NACK) + 1) configured in MIMO mode 2 OtherwiseΔ_(ACK) + 3 Δ_(NACK) + 3 MAX(Δ_(ACK) + 3, Δ_(NACK) + 3) 3 Δ_(ACK) + 3Δ_(NACK) + 3 MAX(Δ_(ACK) + 3, Δ_(NACK) + 3)

In an embodiment, HARQ-ACK power offset setting schemes may be based onprobability of false alarm P_fa=0.1, and performance target Pe_str=1%.Table 26 shows example power offset setting schemes whereSecondary_Cell_Active is bigger than 1.HARQ-ACK power offset may be setsuch that it is bigger than the required max power offset obtained bysimulations.

TABLE 26 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, 2and WTRU is not Δ_(NACK) + 2) configured in MIMO mode 2 OtherwiseΔ_(ACK) + 3 Δ_(NACK) + 3 MAX(Δ_(ACK) + 3, Δ_(NACK) + 3) 3 Δ_(ACK) + 3Δ_(NACK) + 3 MAX(Δ_(ACK) + 3, Δ_(NACK) + 3)

In an embodiment, HARQ-ACK power offset setting schemes may be based onprobability of false alarm P_fa=0.1 and performance target Pe_str=1%.Table 27 shows example power offset setting schemes whereSecondary_Cell_Active is bigger than 1. HARQ-ACK power offset may be setsuch that it is bigger than the required max power offset obtained bysimulations.

TABLE 27 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, 2and WTRU is not Δ_(NACK) + 2) configured in MIMO mode 2 OtherwiseΔ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, Δ_(NACK) + 2) 3 Δ_(ACK) + 3Δ_(NACK) + 3 MAX(Δ_(ACK) + 3, Δ_(NACK) + 3)

In an embodiment, HARQ-ACK power offset setting schemes may be based onprobability of false alarm P_fa=0.1 and performance target Pe_str=1%.Table 28 shows example power offset setting schemes whereSecondary_Cell_Active is bigger than 1. For example, HARQ-ACK poweroffset may be set such that the HARQ-ACK performance may be guaranteed,when the interference level may be increased. HARQ-ACK power offset maybe set such that it is close enough to the required max power offsetobtained by simulations.

TABLE 28 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 1 Δ_(NACK) + 1 MAX(Δ_(ACK) + 1, 2and WTRU is not Δ_(NACK) + 1) configured in MIMO mode 2 Otherwise Δ_(ACK) + 2*  Δ_(NACK) + 2* MAX(Δ_(ACK) + 2*, Δ_(NACK) + 2*) 3Δ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, Δ_(NACK) + 2) Notes: *denotesthat optionally, power offset setting could be +1 instead of +2 tofurther reduce the interference at cost of performance degradation.

In an embodiment, HARQ-ACK power offset setting schemes may be based onprobability of false alarm P_fa=0.1 and performance target Pr_RLC=0.01%.Table 29 shows example power offset setting schemes whereSecondary_Cell_Active is bigger than 1. For example, HARQ-ACK poweroffset may be set such that the HARQ-ACK performance may be guaranteed,when the most power is required. HARQ-ACK power offset may be set suchthat it may be is bigger than the required max power offset obtained bysimulations.

TABLE 29 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, 2and WTRU is not Δ_(NACK) + 2) configured in MIMO mode 2 OtherwiseΔ_(ACK) + 4 Δ_(NACK) + 4 MAX(Δ_(ACK) + 4, Δ_(NACK) + 4) 3 Δ_(ACK) + 4Δ_(NACK) + 4 MAX(Δ_(ACK) + 4, Δ_(NACK) + 4)

In an embodiment, HARQ-ACK power offset setting schemes may be based onprobability of false alarm P_fa=0.1 and performance target Pr_RLC=0.01%.Table 30 shows example power offset setting schemes whereSecondary_Cell_Active is bigger than 1. For example, HARQ-ACK poweroffset may be set such that the HARQ-ACK performance may be guaranteed,when the most power is required. HARQ-ACK power offset may be set suchthat it may be is bigger than the required max power offset obtained bysimulations.

TABLE 30 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, 2and WTRU is not Δ_(NACK) + 2) configured in MIMO mode 2 OtherwiseΔ_(ACK) + 3 Δ_(NACK) + 3 MAX(Δ_(ACK) + 3, Δ_(NACK) + 3) 3 Δ_(ACK) + 4Δ_(NACK) + 4 MAX(Δ_(ACK) + 4, Δ_(NACK) + 4)

In an embodiment, HARQ-ACK power offset setting schemes may be based onprobability of false alarm P_fa=0.1 and performance target Pr_RLC=0.01%.Table 31 shows example power offset setting schemes whereSecondary_Cell_Active is bigger than 1. For example, HARQ-ACK poweroffset may be set such that the HARQ-ACK performance may be guaranteed,when the interference level is increased. HARQ-ACK power offset may beset such that it may be close enough to the required max power offsetobtained by simulations.

TABLE 31 A_(hs) may equal the quantized amplitude ratio translated fromHARQ-ACK message sent in one time slot contains at contains at containsboth ACK least one ACK least one NACK and NACK or is aSecondary_Cell_Active Condition but no NACK but no ACK PRE or is a POST2 Secondary_Cell_Enabled = Δ_(ACK) + 2 Δ_(NACK) + 2 MAX(Δ_(ACK) + 2, 2and WTRU is not Δ_(NACK) + 2) configured in MIMO mode 2 OtherwiseΔ_(ACK) + 3 Δ_(NACK) + 3 MAX(Δ_(ACK) + 3, Δ_(NACK) + 3) 3 Δ_(ACK) + 3Δ_(NACK) + 3 MAX(Δ_(ACK) + 3, Δ_(NACK) + 3)

For a 4C-HSDPA system where three or four carriers are activated, poweroffsetting for HS-DPCCH1 and HS-DPCCH2 CQI slot may follow the rulesdescribed in Table 31. Power offsetting may depend on the CQI typescarried on HS-DPCCH1 and HS-DPCCH2. Power offsetting may be related tothe encoding schemes applied to the CQI reporting.

In an embodiment, power offset for HS-DPCCH CQI slot may be determinedas follows. The power offset A_(hs1) for HS-DPCCH1 CQI slot may bedetermined in accordance with the rules described in Table 32. The poweroffset A_(hs2) for HS-DPCCH2 CQI slot may be determined in accordancewith the rules described in Table 32. The greater between the A_(hs1)and A_(hs2) may be used as the power offset A_(hs) for HS-DPCCH CQIslot, e.g., A_(hs)=max(A_(hs1), A_(hs2)). The HS-DPCCH CQI slot mayinclude a concatenation of HS-DPCCH1 and HS-DPCCH2 for SPREADING FACTOR128, or a superposition of HS-DPCCH1 and HS-DPCCH2 for SF256.

In an embodiment, different power offsets are applied independently tothe two feedback channels. For example, the power offset A_(hs1) may bedetermined and may apply to HS-DPCCH1 PCI/CQI field, and the poweroffset A_(hs2) may be determined and may apply to HS-DPCCH2 PCI/CQIfield.

In an embodiment, the power offset setting may be dynamically adjusted.For example, the use of the rules may be based upon the carrieractivation/deactivation. For example, the use of the rules may be basedupon the channel coding schemes used for each of cells. The use of themaximum power offset value among the feedback groups/channels as acommon setting may keep uniform power setting on the feedback channels.

TABLE 32 # of activated CQI # of carriers CQI type of Rule applying CQItype of Rule applying activated with MIMO HS-DPCCH2 to HS-DPCCH2HS-DPCCH1 to HS-DPCCH1 carriers configured CQI slot CQI slot CQI slotCQI slot 1 0 SC 3D SC 3D 1 SC-MIMO 1C or 3C SC-MIMO 1C or 3C 2 0 DC 2DDC 2D 1 SC 1C or 3C SC 1C or 3C SC-MIMO SC-MIMO 2 SC-MIMO 1C or 3CSC-MIMO 1C or 3C SC-MIMO SC-MIMO 3 0 SC 3C DC 2C 1 SC MIMO 1C or 3C DC2C SC 3C SC 1C or 3C SC-MIMO 2 SC 3C SC-MIMO 1C or 3C SC-MIMO SC-MIMO 1Cor 3C SC 1C or 3C SC-MIMO 3 SC-MIMO 1C or 3C SC-MIMO 1C or 3C SC-MIMO 40 DC 2C DC 2C 1 DC 2C SC 1C or 3C SC-MIMO SC 1C or 3C DC 2C SC-MIMO 2 DC2C SC-MIMO 1C or 3C SC-MIMO SC 1C or 3C SC 1C or 3C SC-MIMO SC-MIMOSC-MIMO 1C or 3C DC 2C SC-MIMO 3 SC 1C or 3C SC-MIMO 1C or 3C SC-MIMOSC-MIMO SC-MIMO 1C or 3C SC 1C or 3C SC-MIMO SC-MIMO 4 SC-MIMO 1C or 3CSC-MIMO 1C or 3C SC-MIMO SC-MIMO

For example, power offset may be determined independently for eachserving cell. Power offset may be determined independently for in afeedback group or in a feedback channel. In Table 32, a table cellcontaining two CQI types may indicate that the power offset for CQI/PCIreports may be determined separately for each of the two serving cellsin the feedback group. For example, a table cell containing “1C or 3C”may indicate that that rule 1C may be applied to a CQI report of Type A,and rule 3C may applied to a CQI report of either Type B if the cell isconfigured in MIMO mode, or a regular CQI type if the cell is notconfigured in MIMO mode.

In Table 32, rules 1C, 2C, and 3C are described in Table 33, and rules1D, 2D, and 3D are described in Table 34. Rules 1D, 2D, and 3D may beapplied when less than three carriers are active, repeated transmissionis performed on the second feedback channel.

For example, the rules in Table 34 may be used when the WTRU isconfigured to repeat the PCI/CQI over the two slots of the HS-DPCCH. Forexample, when the WTRU has one or two activated cells, or zero or onesecondary serving HS-DSCH cell, the PCI/CQI report may be repeated overthe two slots. In an embodiment, the power offset may be reduced, forexample, by 1 step down in the table to compensate for the use ofrepetition that may require less transmission power from the WTRU side.

TABLE 33 Rule Cases applied to Description Rule 1C MIMO dual stream SCA_(hs) may equal the quantized WTRUs, MIMO dual amplitude ratiotranslated stream DC WTRUs (for from the signalled value examplewhenever type A Δ_(CQI) + 1 CQI is transmitted) Rule 2C non-MIMO DCWTRUs A_(hs) may equal the quantized amplitude ratio translated from thesignaled value Δ_(CQI) + 1 Rule 3C non-MIMO SC WTRUs, A_(hs) may equalthe quantized MIMO single stream SC amplitude ratio translated WTRUs,MIMO single from the signaled value Δ_(CQI) stream DC WTRUs.

TABLE 34 Rule Cases applied to Description Rule 1D MIMO dual stream SCA_(hs) may equal the quantized UEs, MIMO dual stream amplitude ratiotranslated DC UEs (for example from the signalled value Δ_(CQI) whenevertype A CQI is transmitted) Rule 2D non-MIMO DC UEs A_(hs) may equal thequantized amplitude ratio translated from the signaled value Δ_(CQI)Rule 3D non-MIMO SC UEs, A_(hs) may equal the quantized MIMO singlestream SC amplitude ratio translated UEs, MIMO single from the signaledvalue stream DC UEs. Δ_(CQI) − 1

Rules 1D, 2D, and 3D may be derived by adjusting a fixed amount of power(for example reducing 3 dB) from the A_(hs) after it is calculated from1C, 2C, 3C respectively in Table 33 with corresponding conditions.

When the WTRU is configured to apply repetition, the rules 1D, 2D and 3Dmay be implemented by reducing the resulting A_(hs) by X dB, or by afixed number of steps down from the quantization table. For example, ifthe WTRU has less than 2 secondary serving HS-DSCH cell active, thenA_(hs) may be reduced by a fixed value which could be a fixed X dB(e.g., 3 dB), or by deriving the value from N (e.g., 1 or 2) step(s)down the quantization table.

In an embodiment, more than two cells may be activated. If the WTRU isnot configured in MIMO mode in any of the active cells in a feedbackchannel/group, then the power offset setting for CQI associated with afeedback group that supports two active cells may be calculatedaccording to rule 2C; the power offset setting for CQI associated with afeedback group that supports one active cell may be calculated by rule3C. If the WTRU is configured in MIMO mode in any one of the cells in agroup, the power offset setting for CQI/PCI slot for this group may becalculated according to rule 1C when a CQI of type A is transmitted; thepower offset setting for CQI/PCI slot for this group may be calculatedby rule 3C when a CQI of type B is transmitted.

In an embodiment, two or less cells may be activated. If the WTRU is notconfigured in MIMO mode in any of the active cells, the power offsetsetting for CQI associated with a feedback group that supports twoactive cells may be calculated according to rule 2D; the power offsetsetting for CQI associated with a feedback group that supports oneactive cell may be calculated according to calculated by rule 3D. If theWTRU is configured in MIMO mode in any one of the cells then the poweroffset setting for CQI/PCI slot for this group may be calculatedaccording to rule 1D when a CQI of type A is transmitted; the poweroffset setting for CQI/PCI slot for this group may be calculatedaccording to rule 3D when a CQI of type B is transmitted.

Table 35 illustrates an example implementation of the CQI power offsetsetting.

TABLE 35 # of activated CQI # of carriers CQI type of Rule applying CQItype of Rule applying activated with MIMO HS-DPCCH2 to HS-DPCCH2HS-DPCCH1 to HS-DPCCH1 carriers configured CQI slot CQI slot CQI slotCQI slot 1 0 SC 3D SC 3D 1 SC-MIMO 1C or 3C SC-MIMO 1C or 3C 2 0 DC 2DDC 2D 1 SC 1C or 3C SC 1C or 3C SC-MIMO SC-MIMO 2 SC-MIMO 1C or 3CSC-MIMO 1C or 3C SC-MIMO SC-MIMO 3 0 SC 3C DC 2C 1 SC MIMO 1C or 3C SC3C SC SC 3C SC 1C or 3C SC-MIMO 2 SC 3C SC-MIMO 1C or 3C SC-MIMO SC-MIMO1C or 3C SC 1C or 3C SC-MIMO 3 SC-MIMO 1C or 3C SC-MIMO 1C or 3C SC-MIMO4 0 DC 2C DC 2C 1 DC 2C SC 1C or 3C SC-MIMO SC 1C or 3C SC 3C SC-MIMO SC2 DC 2C SC-MIMO 1C or 3C SC-MIMO SC 1C or 3C SC 1C or 3C SC-MIMO SC-MIMOSC-MIMO 1C or 3C SC 3C SC-MIMO SC 3 SC 1C or 3C SC-MIMO 1C or 3C SC-MIMOSC-MIMO SC-MIMO 1C or 3C SC 1C or 3C SC-MIMO SC-MIMO 4 SC-MIMO 1C or 3CSC-MIMO 1C or 3C SC-MIMO SC-MIMO

A cell containing two CQI types in Table 35 may indicate that theCQI/PCI reports may be encoded and transmitted separately for each ofthe two cells. For example, a cell containing “1C or 3C” may indicatethat rule 1C may be applied to a CQI report of Type A, and rule 3C maybe applied to a CQI report of Type B if the cell is configured in MIMOmode, or a regular CQI type if the cell is not configured in MIMO mode.

For example, more than two cells may be activated. If the WTRU is notconfigured in MIMO mode in any of the active cells, the power offsetsetting for CQI associated with a feedback group that supports twoactive cells may be calculated according to rule 2C; the power offsetsetting for CQI associated with a feedback group that supports oneactive cell may be calculated according to rule 3C. If the WTRU isconfigured in MIMO mode in any one of the cells in a group then thepower offset setting for CQI/PCI slot for this group may be calculatedaccording to rule 1C when a CQI of type A is transmitted; the poweroffset setting for CQI/PCI slot for this group may be calculatedaccording to rule 3C when a CQI of type B is transmitted.

For example, two or less cells may be activated. If the WTRU is notconfigured in MIMO mode in any of the active cells, then the poweroffset setting for CQI associated with a feedback group that supportstwo active cells may be calculated according to rule 2D; the poweroffset setting for HARQ-ACK associated with a feedback group thatsupports one active cell may be calculated according to rule 3D. If theWTRU is configured in MIMO mode in any one of the cells, then the poweroffset setting for CQI/PCI slot for this group may be calculatedaccording to rule 1D when a CQI of type A is transmitted; the poweroffset setting for CQI/PCI slot for this group may be calculatedaccording to rule 3D when a CQI of type B is transmitted.

Table 36 illustrates an example implementation of the CQI power offsetsetting. The CQI/PCI reports for the cells may be individually encodedand transmitted in a TDM fashion when more than two carriers areactivated.

TABLE 36 # of activated CQI # of carriers CQI type of Rule applying CQItype of Rule applying activated with MIMO HS-DPCCH2 to HS-DPCCH2HS-DPCCH1 to HS-DPCCH1 carriers configured CQI slot CQI slot CQI slotCQI slot 1 0 SC 3D SC 3D 1 SC-MIMO 1C or 3C SC-MIMO 1C or 3C 2 0 DC 2DDC 2D 1 SC 1C or 3C SC 1C or 3C SC-MIMO SC-MIMO 2 SC-MIMO 1C or 3CSC-MIMO 1C or 3C SC-MIMO SC-MIMO 3 0 SC 3C SC 3C SC 1 SC MIMO 1C or 3CSC 3C SC SC 3C SC 1C or 3C SC-MIMO 2 SC 3C SC-MIMO 1C or 3C SC-MIMOSC-MIMO 1C or 3C SC 1C or 3C SC-MIMO 3 SC-MIMO 1C or 3C SC-MIMO 1C or 3CSC-MIMO 4 0 DC 2C SC 3C SC 1 DC 2C SC 1C or 3C SC-MIMO SC 1C or 3C SC 3CSC-MIMO SC 2 DC 2C SC-MIMO 1C or 3C SC-MIMO SC 1C or 3C SC 1C or 3CSC-MIMO SC-MIMO SC-MIMO 1C or 3C SC 3C SC-MIMO SC 3 SC 1C or 3C SC-MIMO1C or 3C SC-MIMO SC-MIMO SC-MIMO 1C or 3C SC 1C or 3C SC-MIMO SC-MIMO 4SC-MIMO 1C or 3C SC-MIMO 1C or 3C SC-MIMO SC-MIMO

A cell containing two CQI types in Table 36 may indicate that theCQI/PCI reports may be encoded and transmitted separately for each ofthe two cells. For example, a cell containing “1C or 3C” may indicatethat rule 1C may be applied to a CQI report of Type A, and rule 3C maybe applied to a CQI report of Type B if the cell is configured in MIMOmode, or a regular CQI type if the cell is not configured in MIMO mode.

Table 37 illustrates an example implementation of the CQI power offsetsetting. For example, 3 non-MIMO carriers may be configured.

TABLE 37 # of activated CQI # of carriers CQI type of Rule applying CQItype of Rule applying activated with MIMO HS-DPCCH2 to HS-DPCCH2HS-DPCCH1 to HS-DPCCH1 carriers configured CQI slot CQI slot CQI slotCQI slot 1 0 SC 3D SC 3D 1 SC-MIMO 1C or 3C SC-MIMO 1C or 3C 2 0 DC 2DDC 2D 1 SC 1C or 3C SC 1C or 3C SC-MIMO SC-MIMO 2 SC-MIMO 1C or 3CSC-MIMO 1C or 3C SC-MIMO SC-MIMO 3 0 SC 3C DC 2C DC 2C SC 3C 1 SC MIMO1C or 3C SC 3C SC SC 3C SC 1C or 3C SC-MIMO 2 SC 3C SC-MIMO 1C or 3CSC-MIMO SC-MIMO 1C or 3C SC 1C or 3C SC-MIMO 3 SC-MIMO 1C or 3C SC-MIMO1C or 3C SC-MIMO 4 0 SC 3C SC 3C SC SC 1 SC 3C SC 1C or 3C SC SC-MIMO SC1C or 3C SC 3C SC-MIMO SC 2 SC 3C SC-MIMO 1C or 3C SC SC-MIMO SC 1C or3C SC 1C or 3C SC-MIMO SC-MIMO SC-MIMO 1C or 3C SC 3C SC-MIMO SC 3 SC 1Cor 3C SC-MIMO 1C or 3C SC-MIMO SC-MIMO SC-MIMO 1C or 3C SC 1C or 3CSC-MIMO SC-MIMO 4 SC-MIMO 1C or 3C SC-MIMO 1C or 3C SC-MIMO SC-MIMO

The columns showing “CQI type of HS-DPCCH” may relate to the channelcoding schemes used to encoding the CQI reports. For example, SC may berelated to (20, 5) Reed Muller code, DC may be related to (20,10) code,and SC-MIMO may be related to (20, 10) code for Type A CQI or (20,7)code for Type B CQI reports.

In an embodiment, HS-DPCCH CQI transmission may be on a per carrierbasis in 4C-HSDPA with a minimum feedback cycle of 4 ms and differentprocessing gain. For example, spreading factor 256 may be used for 3Cwithout MIMO configured, and spreading factor 128 may be used for therest configuration in 4C-HSDPA. The HS-DPCCH power offset for HS-DPCCHslots carrying CQI may be determined as shown in Table 38.

TABLE 38 A_(hs) may equal the quantized amplitude ratio translated fromWTRU not WTRU configured in configured in MIMO mode in a cell MIMO modeCQI of CQI of Secondary_Cell_Active Condition in a cell Type A Type B 2(Note 2) Secondary_Cell_Enabled = Δ_(CQI) N/A N/A 2 (Note 1) 2 and WTRUis not Δ_(CQI) + 1 N/A N/A configured in MIMO mode 2 Otherwise Δ_(CQI) +1 Δ_(CQI) + 2 Δ_(CQI) + 1 3 Δ_(CQI) + 1 Δ_(CQI) + 2 Δ_(CQI) + 1 Note 1:WTRU may transmit composite CQI report for two cells in a subframe. Note2: WTRU may transmit CQI report for a single serving HS-DSCH cell in asubframe. For example, if the (primary) HS-DSCH serving cell and the1^(st) secondary serving HS-DSCH cell are jointly coded by R8 CQIcodebook and the composite CQI report for these two cells is in asubframe, then power offset setting in this row may be used for the2^(nd) secondary serving HS-DSCH cell. Another example is: if the 1^(st)and 2^(nd) secondary serving HS-DSCH cells are jointly coded by R8 CQIcodebook and the composite CQI report for these two cells is in asubframe, the power offset setting in this row may be used for the(primary) HS-DSCH serving cell.

To conservatively compensate the loss of processing gain due toSPREADING FACTOR 128, scheme 2 may be implemented by adding 1 to poweroffset step for the third and fourth rows of scheme 1: the HS-DPCCHpower setting for HS-DPCCH slots carrying CQI as shown in Table 39.Table 39 shows Scheme 2: CQI power offset setting.

TABLE 39 A_(hs) may equal the quantized amplitude ratio translated fromWTRU not WTRU configured in configured in MIMO mode in a cell MIMO modeCQI of CQI of Secondary_Cell_Active Condition in a cell Type A Type B 2(Note 2) Secondary_Cell_Enabled = Δ_(CQI) N/A N/A 2 (Note 1) 2 and WTRUis not Δ_(CQI) + 1 N/A N/A configured in MIMO mode 2 Otherwise Δ_(CQI) +2 Δ_(CQI) + 3 Δ_(CQI) + 2 3 Δ_(CQI) + 2 Δ_(CQI) + 3 Δ_(CQI) + 2 Note 1:WTRU may transmit composite CQI report for two cells in a subframe. Note2: WTRU may transmit CQI report for a single serving HS-DSCH cell in asubframe. For example, if the (primary) HS-DSCH serving cell and the1^(st) secondary serving HS-DSCH cell are jointly coded by R8 CQIcodebook and the composite CQI report for these two cells is in asubframe, then power offset setting in this row may be used for the2^(nd) secondary serving HS-DSCH cell. Another example is: if the 1^(st)and 2^(nd) secondary serving HS-DSCH cells are jointly coded by R8 CQIcodebook and the composite CQI report for these two cells is in asubframe, then the power offset setting in this row may be used for the(primary) HS-DSCH serving cell.

In an embodiment, the power offset for CQI/PCI may be performed asfollows. For example, more than two cells may be activated. If the WTRUis not configured in MIMO mode in any of the active cells in a group,the power offset setting for CQI for all cells may be calculatedaccording to rule 3C. If the WTRU is configured in MIMO mode in any oneof the cells in a group then the power offset setting for CQI/PCI slotfor this group may be calculated according to rule 1C when a CQI of typeA is transmitted; the power offset setting for CQI/PCI slot for thisgroup may be calculated according to rule 3C when a CQI of type B istransmitted.

For example, two or less cells may be activated. If the WTRU is notconfigured in MIMO mode in any of the active cells, the power offsetsetting for CQI associated with a feedback group that supports twoactive may be calculated according to rule 2D; the power offset settingfor CQI associated with a feedback group that supports one active cellmay be calculated according to rule 3D. If the WTRU is configured inMIMO mode in any one of the cells, then the power offset setting forCQI/PCI slot for this group may be calculated according to rule 1D whena CQI of type A is transmitted; the power offset setting for CQI/PCIslot for this group is calculated by rule 3D when a CQI of type B istransmitted.

For example, the pair of DL carriers may include the primary carrier.The A_(hs) for HS-DPCCH slots carrying CQI may be determined as follows.When a CQI of type A is transmitted, A_(hs1) may equal the quantizedamplitude ratio translated from the signaled value Δ_(CQI)+1. Otherwise,if the WTRU is not configured in MIMO mode and Secondary_Cell_Active isnot 0, A_(hs1) may equal the quantized amplitude ratio translated fromthe signaled value Δ_(CQI)+1. Otherwise, A_(hs1) may equal the quantizedamplitude ratio translated from the signaled value Δ_(CQI).

For the rest of the pair of DL carriers, The A_(hs) for HS-DPCCH slotscarrying CQI may be determined as follows. When a CQI of type A istransmitted, A_(hs2) may equal the quantized amplitude ratio translatedfrom the signaled value Δ_(CQI)+1 Otherwise, if the WTRU is notconfigured in MIMO mode and Secondary_Cell2_Active is not 0 andSecondary_Cell3_Active is not 0, A_(hs2) may equal the quantizedamplitude ratio translated from the signaled value Δ_(CQI)+1. Otherwise,A_(hs2) may equal the quantized amplitude ratio translated from thesignaled value Δ_(CQI).

In an embodiment, A_(hs) may equal the greatest of the calculated valuesA_(hs1) and A_(hs2).

Static spreading factor switching means that the spreading factor ofHS-DPCCH is based on the number of the carriers configured. For example,spreading factor 128 may be used when three or four carriers areconfigured and spreading factor 256 may be used when less than threecarries are configured.

If spreading factor 128 is used for all cases of three or four carriersconfigured, power setting rule when three or four carriers are activatedmay follow as described above.

For example, two or three carriers may be deactivated. Codewordrepetition may be performed before the power offset setting is applied.In an embodiment, the power offset setting rules in Table 19 and Table32 may be applied, and a 3 dB power reduction may be applied. In anembodiment, the network may signal two sets of power offset values, suchas (Δ_(ACK), Δ_(NACK), Δ_(CQI)), one set for spreading factor 128, andone set for spreading factor 256. The power offset setting rulesdescribed in Table 19 and Table 32 may be applied using the values of(Δ_(ACK), Δ_(NACK), Δ_(CQI)) signaled for spreading factor 256.

If spreading factor 256 is used for cases of less than three carriersconfigured, power setting rule may follow the rules described in Table19 and Table 32.

In an embodiment, dynamic spreading factor switching may be configured.For example, the spreading factor of HS-DPCCH may be changed based onthe number of the activated carriers. For example, spreading factor 128may be used when three or four carriers are activated and the WTRU mayswitch to spreading factor 256 when two or three carries aredeactivated, for example, using HS-SCCH orders. When spreading factor128 is used, the power offset setting rules described above may apply.When spreading factor 256 is used, the rules described in Table 19 andTable 32 may apply. When spreading factor switching happens, a furtherΔ_(SF) power boosting or reduction may be used to determine the finalvalue of A_(hs), depending on the switching direction (switching tospreading factor 128 or to spreading factor 256). The value Δ_(SF) maybe signaled by higher layers. The value Δ_(SF) may be a predetermined ora fixed value, e.g., 3 dB or the like.

In an embodiment, power offset may be determined based on anactivation/deactivation order. In a multi-carrier such as MC-HSDPAsystem, where the WTRU is configured with more than two cells, anHS-SCCH activation/deactivation order may change HS-DPCCH frame format.For example, when the number of active cells is deactivated to two oractivated from two to more cells by an HS-SCCH activation/deactivationorder, the HS-DPCCH frame format for both HARQ-ACK and CQI/PCI reportsmay change. The change may be because of the use of the repetition mode.The power offset under the repetition mode in the case of one or twocells are active may be altered accordingly such that the WTRU transmitpower usage as described in Table 18 and Table 33 may be optimized.

At the time the change of HS-DPCCH frame format occurs, the WTRU andNode B may be synchronized such that HS-DPCCH may be handled in aconsistent manner. For example, when the WTRU receives a correct HS-SCCHorder for deactivating to two cells, or to activating from two to morecells, the response of ACK to the order reported in HS-DPCCH iserroneously received by the Node B due to detection error. In this case,the Node B may have difficulty continuing to receive the correctHARQ-ACK and CQI/PCI reports for the active cells because the frameformat the Node B uses for decoding may not be in line with what isbeing used from the transmitter.

To reduce the probability of occurrence of this error event, a boost oftransmit power on the signal that carries the ACK response to theactivation/deactivation order may be used. For example, boost may beapplied to the whole HARQ-ACK slot such that a uniform power setting forthe two feedback channels may be maintained. For example, boost may beapplied to a first time slot of the sub-frame over which the ACKresponse is sent.

In an embodiment, power offset for the feedback channel that carries theACK response to an activation/deactivation order may be set as follows.If the feedback channel supports one cell, A_(hs) may equal thequantized amplitude ratio translated from the signaled value Δ_(ACK)+1if the corresponding HARQ-ACK message is ACK; A_(hs) may equal thequantized amplitude ratio translated from the signaled value Δ_(ACK)+2if the corresponding HARQ-ACK message is ACK/ACK; A_(hs) may equal thequantized amplitude ratio translated from the greatest of (Δ_(ACK)+2)and (Δ_(NACK)+1) if the corresponding HARQ-ACK message is ACK/NACK,NACK/ACK, PRE before a dual transport block or POST after a dualtransport block. Otherwise, if the WTRU is not configured in MIMO mode,A_(hs) may equal the quantized amplitude ratio translated from thesignaled value Δ_(ACK)+2 if the corresponding HARQ-ACK message containsat least one ACK but no NACK; A_(hs) may equal the quantized amplituderatio translated from the greatest of (Δ_(ACK)+2) and (Δ_(NACK)+1) ifthe corresponding HARQ-ACK message contains both ACK and NACK, or is aPRE or a POST. If the WTRU is configured in MIMO mode A_(hs) may equalthe quantized amplitude ratio translated from the signaled valueΔ_(ACK)+2 if the corresponding HARQ-ACK message contains at least oneACK but no NACK; A_(hs) may equal the quantized amplitude ratiotranslated from the greatest of (Δ_(ACK)+2) and (Δ_(NACK)+1) if thecorresponding HARQ-ACK message contains both ACK and NACK, or is a PREor a POST.

In an embodiment, the A_(hs) value for the feedback channel that carriesthe ACK response to the order may be calculated as described above. TheA_(hs) value for the other feedback channel may be calculated. Thegreater of the two may be the common power offset setting applied to theHARQ-ACK slot.

This approach may apply to the cases of the ACK response to an HS-SCCHactivation/deactivation order, or to these orders that results in thetransition between 1C/2C to/from 3C/4C.

In an embodiment, power offset for the feedback channel that carries theACK response to an activation/deactivation order may be set as follows.A_(hs) for ACK response to a deactivation order to two active cells maybe determined as follows. If the feedback channel support one cell,A_(hs) may equal the quantized amplitude ratio translated from thesignaled value Δ_(ACK)+1 if the corresponding HARQ-ACK message is ACK;A_(hs) may equal the quantized amplitude ratio translated from thesignaled value Δ_(ACK)+2 if the corresponding HARQ-ACK message isACK/ACK; A_(hs) may equal the quantized amplitude ratio translated fromthe greatest of (Δ_(ACK)+2) and (Δ_(NACK)+1) if the correspondingHARQ-ACK message is ACK/NACK, NACK/ACK, PRE before a dual transportblock or POST after a dual transport block. Otherwise, if the WTRU isnot configured in MIMO mode, A_(hs) may equal the quantized amplituderatio translated from the signaled value Δ_(ACK)+2 if the correspondingHARQ-ACK message contains at least one ACK but no NACK; A_(hs) may equalthe quantized amplitude ratio translated from the greatest of(Δ_(ACK)+2) and (Δ_(NACK)+1) if the corresponding HARQ-ACK messagecontains both ACK and NACK, or is a PRE or a POST. Otherwise, A_(hs) mayequal the quantized amplitude ratio translated from the signaled valueΔ_(ACK)+2 if the corresponding HARQ-ACK message contains at least oneACK but no NACK; A_(hs) may equal the quantized amplitude ratiotranslated from the greatest of (Δ_(ACK)+2) and (Δ_(NACK)+1) if thecorresponding HARQ-ACK message contains both ACK and NACK, or is a PREor a POST.

A_(hs) for ACK response to an activation order from one or two to morethan two active cells may be determined as follows. If the feedbackchannel support one cell, A_(hs) may equal the quantized amplitude ratiotranslated from the signalled value Δ_(ACK) if the correspondingHARQ-ACK message is ACK; A_(hs) may equal the quantized amplitude ratiotranslated from the signaled value Δ_(ACK)+1 if the correspondingHARQ-ACK message is ACK/ACK; A_(hs) may equal the quantized amplituderatio translated from the greater of (Δ_(ACK)+1) and Δ_(NACK) if thecorresponding HARQ-ACK message is ACK/NACK, NACK/ACK, PRE before a dualtransport block or POST after a dual transport block. Otherwise, if theWTRU is not configured in MIMO mode, A_(hs) may equal the quantizedamplitude ratio translated from the signaled value Δ_(ACK)+1 if thecorresponding HARQ-ACK message contains at least one ACK but no NACK;A_(hs) may equal the quantized amplitude ratio translated from thegreatest of (Δ_(ACK)+1) and Δ_(NACK), if the corresponding HARQ-ACKmessage contains both ACK and NACK, or is a PRE or a POST. Otherwise,A_(hs) may equal the quantized amplitude ratio translated from thesignaled value Δ_(ACK)+1 if the corresponding HARQ-ACK message containsat least one ACK but no NACK; A_(hs) may equal the quantized amplituderatio translated from the greatest of (Δ_(ACK)+1) and Δ_(NACK) if thecorresponding HARQ-ACK message contains both ACK and NACK, or is a PREor a POST.

For the other ACK responses to an activation/deactivation order, thevalue A_(hs) may be calculated without power boost.

In an embodiment, A_(hs) for the feedback channel that carries the ACKresponse to the order may be calculated as described above. The A_(hs)for the other feedback channel may be calculated. The greater of the twomay be the common power offset setting applied to the HARQ-ACK slot.

For example, when the ACK response to an HS-SCCH activation/deactivationorder or to orders that results in the transition between 1C/2C to/from3C/4C, the same rules may be applied to calculate power offset settingfor the feedback channels. A constant or predetermined power boost (forexample, 2 dB) may be applied to the resulting scaling factor A_(hs).

In an embodiment, a power boost may be prolonged for a short of periodafter deactivation order to two active carriers is received. This maymitigate the impact of the error event described in the previoussection, as the HS-DPCCH power may be adjusted downwards already in therepetition mode to optimize the transmit power usage at WTRU. The samepower offset setting may be maintained as if there was no deactivationfor N sub-frames such that the Node B may be able to decode the HS-DPCCHcorrectly even if applied frame format is wrong in the case of the errorevent.

For example, a reference time point may be defined. For example, thereference time could be defined as 12.5 (or 18.5 slots if dual uplinkcarrier is configured) after receiving the HS-SCCH order. A value N maybe chosen as an integer number of round trip time for one reception (RTTexpressed in sub-frames): N=M×RRT, targeting to allow Node B to receivethe response to M HARQ transmissions. FIG. 42 illustrates a diagram of aprolonged power boost period.

For illustration purposes, A_(hs,x) may denote the quantized amplituderatio for the HS-DPCCH associated to the feedback channel x, x=1,2. Whenan HS-DPCCH operates in a dual feedback channel mode, the values forΔ_(ACK), Δ_(NACK) and Δ_(CQI) may be set by higher layers and may betranslated to the quantized amplitude ratios A_(hs,1) and A_(hs,2)respectively for the first and second feedback channels/groups.

A_(hs) for HS-DPCCH slots carrying HARQ Acknowledgement and for eachfeedback channel carrying HARQ Acknowledgement may be determined asfollows. If the feedback channel carries HARQ Acknowledgementinformation for a single HS-DSCH cell, A_(hs) may equal the quantizedamplitude ratio translated from the signaled value Δ_(ACK) if thecorresponding HARQ-ACK message is ACK; A_(hs) may equal the quantizedamplitude ratio translated from the signaled value Δ_(NACK) if thecorresponding HARQ-ACK message is NACK; A_(hs) may equal the quantizedamplitude ratio translated from the greatest of the signaled valuesΔ_(ACK) and Δ_(NACK) if the corresponding HARQ-ACK message is PRE beforea single transport block or POST after a single transport block. A_(hs)may equal the quantized amplitude ratio translated from the signaledvalue Δ_(ACK)+1 if the corresponding HARQ-ACK message is ACK/ACK; A_(hs)may equal the quantized amplitude ratio translated from the signaledvalue Δ_(NACK)+1 if the corresponding HARQ-ACK message is NACK/NACK;A_(hs) may equal the quantized amplitude ratio translated from thegreatest of (Δ_(ACK)+1) and (Δ_(NACK)+1) if the corresponding HARQ-ACKmessage is ACK/NACK, NACK/ACK, PRE before a dual transport block or POSTafter a dual transport block. Otherwise, if none of the HS-DSCH cellssupported by the feedback channel is configured in MIMO mode, A_(hs) mayequal the quantized amplitude ratio translated from the signaled valueΔ_(ACK)+1 if the corresponding HARQ-ACK message contains at least oneACK but no NACK; A_(hs) may equal the quantized amplitude ratiotranslated from the signaled value Δ_(NACK)+1 if the correspondingHARQ-ACK message contains at least one NACK but no ACK; A_(hs) may equalthe quantized amplitude ratio translated from the greatest of(Δ_(ACK)+1) and (Δ_(NACK)+1) if the corresponding HARQ-ACK messagecontains both ACK and NACK, or is a PRE or a POST. Otherwise, A_(hs) mayequal the quantized amplitude ratio translated from the signaled valueΔ_(ACK)+1 if the corresponding HARQ-ACK message contains at least oneACK but no NACK; A_(hs) may equal the quantized amplitude ratiotranslated from the signaled value Δ_(NACK)+1 if the correspondingHARQ-ACK message contains at least one NACK but no ACK; A_(hs) may equalthe quantized amplitude ratio translated from the greatest of(Δ_(ACK)+1) and (Δ_(NACK)+1) if the corresponding HARQ-ACK messagecontains both ACK and NACK, or is a PRE or a POST. A_(hs) may equal thequantized amplitude ratio translated from the signaled value Δ_(ACK)+2if the corresponding HARQ-ACK message contains at least one ACK but noNACK; A_(hs) may equal the quantized amplitude ratio translated from thesignaled value Δ_(NACK)+2 if the corresponding HARQ-ACK message containsat least one NACK but no ACK; A_(hs) may equal the quantized amplituderatio translated from the greatest of Δ_(ACK)+2) and (Δ_(NACK)+2) if thecorresponding HARQ-ACK message contains both ACK and NACK, or is a PREor a POST.

If more than one feedback channel is used and if the translatedquantized amplitude ratio is associated to the first feedback channel,A_(hs,1) may equal A_(hs). If more than one feedback channel is used andif the translated quantized amplitude is associated to the secondfeedback channel, A_(hs,2) may equal A_(hs).

When HS-DPCCH slots carry CQI on each feedback channel, power offset maybe determined as follows. When a CQI of type A is transmitted, A_(hs)may equal the quantized amplitude ratio translated from the signaledvalue Δ_(CQI)+1. Otherwise, if none of the HS-DSCH cells supported bythe feedback channel is configured in MIMO mode, A_(hs) may equal thequantized amplitude ratio translated from the signaled value Δ_(CQI)+1.Otherwise, A_(hs) may equal the quantized amplitude ratio translatedfrom the signaled value Δ_(CQI).

If more than one feedback channel is used and if the translatedquantized amplitude ratio is associated to the first feedback channel,A_(hs,1) may equal A_(hs). If more than one feedback channel is used andif the translated quantized amplitude is associated to the secondfeedback channel, A_(hs,2) may equal A_(hs).

In non-compressed frames, β_(hs,1) and β_(hs,2), which may be the gainfactors for each of individual feedback channels, may be calculatedaccording to

β_(hs,1)=β_(c) ·A _(hs,1),

β_(hs,1)=β_(c) ·A _(hs,2)

where β_(c) value may be signaled by higher layers or calculated, if atleast one DPDCH is configured. In case no DPDCH is configured, β_(c)value may be set as described in subclause 5.1.2.5C of 3GPP TS 25.214.

The greater of A_(hs,1) and A_(hs,2) may be applied to calculate thegain factor common for both feedback channels. In non-compressed framesβ_(hs), which may denote a gain factor that may be calculated accordingto

β_(hs)=β_(c) ·A _(hs),

where A_(hs) may be the greater of A_(hs,1) and A_(hs,1) obtained fromthe two feedback channels, and β_(c) value may be signaled byhigher-layer or calculated if at least one DPDCH is configured. In caseno DPDCH is configured, β_(c) value may be set as described in subclause5.1.2.5C of 3GPP TS 25.214.

In an embodiment, the common power offset setting to the HARQ-ACK slotfor both feedback channels while keeping separate power settings forCQI/PCI slots for different feedback channels. For example, A_(hs,1) andA_(hs,2) may be individually calculated according to the rules describedin the above for the HARQ-ACK feedback. The greater of the two may beselected as the power offset setting A_(hs) for the HARQ-ACK slot. ForHS-DPCCH slots allocated to CQI/PCI, the A_(hs,1) and A_(hs,2) may beindividually calculated according to the rules described above for theCQI/PCI feedback. The A_(hs,1) and A_(hs,2) may be individually appliedto the HS-DPCCH slots allocated to the first and second feedbackchannels respectively.

When carrier activation status changes, e.g., some carriers or cells areactivated or deactivated by an HS-SCCH activation/deactivation order,the power offset setting for each of the HS-DPCCH slots may berecalculated. For example, the number of cells in a feedback channel maybe reduced or increased, which may lead to change of the coding schemesbeing used. Allowing different power settings for each of the feedbackchannels for CQI reporting may require for dynamic update of the A_(hs),on a per time slot basis.

In an embodiment, A_(hs,1) and A_(hs,2) may be calculated for every timeslot, and the maximum value at the WTRU may be identified if the timeslot is allocated for HARQ-ACK transmission. In an embodiment, a set ofthe possible power setting values may be pre-calculated based on thecarrier activation status. The pre-calculated values may be stored in atable upon the time the WTRU receives the activation/deactivation order.The set of values is dynamically applied to each time slot via tablelookup method in the following sub-frames according to HS-SCCH slotstatus. The timing for the pre-calculation may the 12 slots, or 18 slotsfor dual uplink carriers, of interval right after the HS-SCCHactivation/deactivation order is delivered to WTRU, during which nodownlink transmission activation is assumed.

Feedback fields and or channel slots may be associated with downlinkcarriers. The WTRU may be configured by the network via RRC signalingwith two or three secondary serving HS-DSCH cells. For illustrationpurposes, the serving HS-DSCH cell may be denoted as Cell1. Thesecondary serving HS-DSCH cells are labeled according to the position ofthe associated information element in the RRC message. For example, thefirst secondary serving HS-DSCH cell configured in the RRC message islabeled Cell2, and the second and third secondary serving HS-DSCH cellsconfigured are labeled Cell3 and Cell4, respectively.

For illustration purposes, the feedback channel slot for the HARQ-ACKfields may be denoted as F_(fc,n) where fc=1,2 is the feedback channelindex and n=1,2 is the index of the HARQ-ACK field within the feedbackchannel. For example, when the secondary serving HS-DSCH cell is activeand the WTRU is configured in MIMO mode, there may be two feedback slotsfor the HARQ-ACK field. The first slot, denoted by index n=1, may beassociated with the serving HS-DSCH cell. The second slot may beassociated with the secondary serving HS-DSCH cell that may be denotedby index n=2. When one secondary serving HS-DSCH cell is active and theWTRU is configured in MIMO, the feedback channel slot for the servingHS-DSCH cell may be denoted by F_(1,1) and the feedback channel slot forthe secondary serving HS-DSCH may be denoted by F_(1,2).

In an embodiment, the association between the configured HS-DSCH cellsand the feedback channel slot may be based on the configuration order ofthe HS-DSCH cells in the RRC message as illustrated in Table 40.

TABLE 40 Feedback channel slot Associated HS-DSCH cell F_(1, 1) Cell1F_(1, 2) Cell2 F_(2, 1) Cell3 F_(2, 2) Cell4

In an embodiment, the association may be fixed regardless of theactivation/deactivation status of each individual secondary HS-DSCHcell. In an embodiment, the association may be dynamic and depend on theactivation/deactivation status of each HS-DSCH cell. For example, theassociation may depend on the configuration order, such that the entriesfor the deactivated HS-DSCH cell may be removed from the list whilekeeping the configuration order. Table 41 shows example associationswhen one HS-DSCH cell is deactivated.

TABLE 41 Associated HS-DSCH cell Cell2 Cell3 Cell4 Feedback channel slotdeactivated deactivated deactivated F_(1, 1) Cell1 Cell1 Cell1 F_(1, 2)Cell3 Cell2 Cell2 F_(2, 1) Cell4 Cell4 Cell3 F_(2, 2) — — —

Table 42 shows example associations when two carriers or HS-DSCH cellsare deactivated.

TABLE 42 Associated HS-DSCH cell Cell2, Cell3 Cell2, Cell4 Cell3, Cell4Feedback channel slot deactivated deactivated deactivated F_(1, 1) Cell1Cell1 Cell1 F_(1, 2) Cell4 Cell3 Cell2 F_(2, 1) — — — F_(2, 2) — — —

When two secondary serving HS-DSCH cells are configured, Cell1, Cell2and Cell3 may be associated with feedback channel slots. Table 43 showsexample associations when two secondary serving HS-DSCH cells areconfigured.

TABLE 43 Associated HS-DSCH cell No carrier Cell2 Cell3 Feedback channelslot deactivated deactivated deactivated F_(1, 1) Cell1 Cell1 Cell1F_(1, 2) Cell2 Cell3 Cell2 F_(2, 1) Cell3 — — F_(2, 2) — — —

In an embodiment, CQI reports may be generated and transmitted based ona CQI transmission pattern on a per transmission time interval (TTI)basis. For example, CQI reports may be generated and transmittedaccording to the CQI feedback cycle parameter, k, and CQI repetitionfactor parameter, N_cqi_transmit. The CQI feedback cycle parameter, kand repetition factor parameter, N_cqi_transmit may be configured fromhigher layers in the WTRU and the Node B.

In an embodiment, the CQI feedback cycle may be configuredcarrier-specific. The CQI feedback cycle for each of the carriers may beconfigured independently with different CQI repetition factors.Independent configuration may provide flexibility for specificperformance optimization that may be performed on each individualcarrier. For example, separate parameters may be configured for eachsecondary carrier. Denote k₁, k₂, k₃ as the CQI feedback cycle parameterfor each respective carrier. Denote N_cqi_transmit_(—)1,N_cqi_transmit_(—)2, N_cqi_transmit_(—)3 as the CQI repetition factorparameter for each respective carrier. The parameters may be configuredfrom higher layers in the WTRU and the Node B.

The carriers may be grouped into pairs. For each pair of carriers thatshare the same feedback channel, the CQI/PCI feedback may be transmittedwith a constant time offset between the two carriers that may equal tothe number of TTIs represented by the repetition factor of the firstcarrier. To illustrate, denote k, N_cqi_transmit, as the parametersetting for the first carrier in the pair, and k₁, N_cqi_transmit_(—)1for the second carrier in the pair. The following formulas may beapplied to determine the CQI transmission pattern. CQI/PCI for the firstcarrier in the group may be transmitted in the sub-frame that maysatisfy the following formula:

(5×CFN+┌m×256chip/7680chip┐)mod k′=0 with k′=k/(2 ms),  Equation (1).

The same CQI/PCI information may be repeated for the nextN_cqi_transmit−1 consecutive sub-frames. CQI/PCI for the second carrierin the group may be transmitted in the sub-frame that satisfies thefollowing formula:

(5×CFN+┌m×256chip/7680chip┐)mod k ₁ ′=N_cqi_transmit with k ₁ ′=k ₁/(2ms),  Equation (2).

The same CQI/PCI information may be repeated for the nextN_cqi_transmit_(—)1−1 consecutive sub-frames.

The following constraint may be imposed on the configuration parameters:

min(k′,k ₁′)≧(N_cqi_transmit+N_cqi_transmit_(—)1),  Equation (3)

and max(k,k₁) is required to be divisible by min(k,k₁). This may avoidoverlap between the CQI/PCI information from the two carriers due todifferent CQI feedback cycle settings.

The transmission of CQI/PCI in two feedback channels may be madeindependently according to the rules described in the above, with theuse of different feedback cycle and repetition factor parametersspecified for each carrier. Because both the WTRU and the eNode B followthe same rule to calculate the location of the CQI/PCI in thetransmission, the carrier association to the CQI/PCI information may beuniquely identified.

FIG. 43 shows an example carrier specific feedback cycle for one pair ofcarriers. Each block may represent the CQI/PCI information sent in onesub-frame. The parameters used may include k=8 ms, k₁=16 ms,N_cqi_transmit=1, and N_cqi_transmit_(—)1=3. The dashed block in FIG. 43may represent CQI/PCI for the first carrier may not be transmitted dueto the longer feedback cycle.

In case of 3 carriers, one feedback channel may contain the informationfor one carrier. The other feedback channel that supports two carriersmay be handled as described above with respect to a feedback channelcontaining information for two carriers.

In an example, the WTRU may not be configured in MIMO mode. With theexception of the provisions of subclause 6A.3 in 3GPP 25.214 v9.0.0, theCQI/PCI may be reported as follows. The WTRU may derive the CQI valuefor the serving HS-DSCH cell as defined in subclause 6A.2.1 in 3GPP25.214 v9.0.0. If Secondary_Cell_Active is 1, the WTRU may derive a CQIvalue(s) for the secondary serving HS-DSCH cell(s) as defined insubclause 6A.2.1 in 3GPP 25.214 v9.0.0. The CQI report may beconstructed from the CQI value(s). The CQI values from the servingHS-DSCH and secondary serving HS-DSCH cells may be grouped into twosets.

Each set of CQI may be transmitted through one of two HS-DPCCH feedbackchannels. In each of the feedback channels, assuming the CQI feedbackcycle and repetition factor for the first HS-DSCH cell are k andN_cqi_transmit respectively, and for the second HS-DSCH cell are k₁ andN_cqi_transmit_(—)1 respectively. For example, when k=0, the WTRU maynot transmit the CQI report. For k>0 when DTX_DRX_STATUS is not TRUE,the WTRU may transmit the CQI report of the first HS-DSCH cell in eachsubframe that starts m×256 chips after the start of the associateduplink DPCCH frame with m fulfilling:

(5×CFN+┌m×256chip/7680chip┐)mod k′=0 with k′=k/(2 ms),

where CFN denotes the connection frame number for the associated DPCHand the set of five possible values of m is calculated. For k>0 whenDTX_DRX_STATUS is TRUE, the WTRU may transmit the CQI report of thefirst HS-DSCH cell based on the CQI transmission pattern. The CQItransmission pattern is the set of HS-DPCCH subframes whose HS-DPCCHdiscontinuous transmission radio frame number CFN_DRX and subframenumber S_DRX, verify:

((5*CFN_(—) DRX−WTRU _(—) DTX _(—) DRX_Offset+S _(—) DRX)MOD k′)=0, withk′=k/(2 ms).

The WTRU may repeat the transmission of the CQI report of the firstHS-DSCH cell derived in 1) over the next (N_cqi_transmit−1) consecutiveHS-DPCCH sub frames in the slots respectively allocated to the CQI.

For k₁=0, the WTRU may not transmit the CQI report. For k₁>0 whenDTX_DRX_STATUS is not TRUE, the WTRU may transmit the CQI report of thesecond HS-DSCH cell in each subframe that starts m×256 chips after thestart of the associated uplink DPCCH frame with m fulfilling:

(5×CFN+┌m×256chip/7680chip┐)mod k ₁ ′=N_cqi_transmit with k ₁ ′=k ₁/(2ms),

where CFN denotes the connection frame number for the associated DPCHand the set of five possible values of m is calculated. For k>0 whenDTX_DRX_STATUS is TRUE, the WTRU may transmit the CQI report of thesecond HS-DSCH cell based on the CQI transmission pattern. The CQItransmission pattern may be the set of HS-DPCCH subframes whose HS-DPCCHdiscontinuous transmission radio frame number CFN_DRX and subframenumber S_DRX, verify:

((5*CFN_(—) DRX−UE_(—) DTX _(—) DRX_Offset+S _(—) DRX)MOD k₁′)=N_cqi_transmit, with k ₁ ′=k ₁/(2 ms).

The WTRU may repeat the transmission of the CQI report of the secondHS-DSCH cell derived in 1) over the next (N_cqi_transmit_(—)1−1)consecutive HS-DPCCH sub frames in the slots respectively allocated tothe CQI. The WTRU may not support the cases that do not satisfymin(k′,k₁′) (N_cqi_transmit+N_cqi_transmit_(—)1).

In an embodiment, the WTRU may not transmit the CQI in other subframesthan the scenarios described above.

The CQI reporting procedure for the other feedback channel may followthe same rules as defined above except that the CQI feedback cycle andrepetition factor parameters are defined differently as k2, k3,N_cqi_transmit_(—)2, and N_cqi_transmit_(—)3.

CQI/PCI reporting may be implemented as follows when the WTRU isconfigured in MIMO mode. In an embodiment, CQI feedback cycle may begroup-specific. For example, two sets of CQI configuration parametersmay be specified for each of the feedback channels, k, N_cqi_transmitfor first feedback channel, and k1, N_cqi_transmit_(—)1 for secondfeedback channel.

When grouping the carriers for mapping their CQI information into thefeedback channels, CQI transmission may be performed as follows. Forexample, the carriers in the same band may share the same feedbackchannel. For example, MIMO configured carriers may be grouped in afeedback channel and non-MIMO carriers may be grouped in a feedbackchannel. For example, carries the data with similar quality of service(QoS) requirement may be grouped into the same feedback channel. Variouslevels of performance requirements among the carriers may be addressedby different CQI configuration parameters assigned to related feedbackchannel.

For each feedback channel, CQI/PCI reporting rules may be appliedindependently to the transmission of the CQI/PCI feedback using theparameter set defined for that feedback channel. The repetition of CQIsfor the two carriers in the feedback channel may be implemented indifferent ways. The CQI of the first carrier may be repeated inN_cqi_transmit (or N_cqi_transmit_(—)1) consecutive sub-frames followedby repeating the CQI of the second carrier in next N_cqi_transmit (orN_cqi_transmit_(—)1) sub-frames. For example, the CQIs of the first andsecond carriers may be repeated for N_cqi_transmitterN_cqi_transmit_(—)1) times. For example, the CQI of the first carriermay be repeated for N sub-frames where N is pre-configured orpre-defined parameter, and the CQI for the secondary carrier may berepeated for N sub-frames. This procedure may continue until therepetition factor is reached.

For example, the WTRU may not be configured in MIMO mode. With theexception of the provisions of subclause 6A.3 in 3GPP 25.214 v9.0.0, theCQI/PCI may be reported as follows when the WTRU is not configured inMIMO mode. The WTRU may derive the CQI value for the serving HS-DSCHcell. If Secondary_Cell_Active is 1, the WTRU may derive CQI value(s)for the secondary serving HS-DSCH cell(s) as defined in subclause6A.2.1. The CQI report is constructed from the CQI value(s). The CQIvalues from the serving HS-DSCH and secondary serving HS-DSCH cells maybe grouped into two sets. Each set may be transmitted through one of twoHS-DPCCH feedback channels.

For the HS-DSCH cells in first feedback channel, for k=0, the WTRU maynot transmit the CQI report. For k>0 when DTX_DRX_STATUS is not TRUE,the WTRU may transmit the CQI report of the first HS-DSCH cell in eachsubframe that starts m×256 chips after the start of the associateduplink DPCCH frame with m fulfilling:

(5×CFN+┌m×256chip/7680chip┐)mod k′=0 with k′=k/(2 ms),

where CFN denotes the connection frame number for the associated DPCHand the set of five possible values of m may be calculated. For k>0 whenDTX_DRX_STATUS is TRUE, the WTRU may transmit the CQI report of thefirst HS-DSCH cell based on the CQI transmission pattern. The CQItransmission pattern may be the set of HS-DPCCH subframes whose HS-DPCCHdiscontinuous transmission radio frame number CFN_DRX and subframenumber S_DRX, verify:

((5*CFN_(—) DRX−UE_(—) DTX _(—) DRX_Offset+S_DRX)MOD k′)=0, with k′=k/(2ms).

The WTRU may repeat the transmission of the CQI report of the firstHS-DSCH cell derived in over the next (N_cqi_transmit−1) consecutiveHS-DPCCH sub frames in the slots respectively allocated to the CQI. TheWTRU may repeat the transmission of the CQI report of the second HS-DSCHcell derived in over the next N_cqi_transmit consecutive HS-DPCCH subframes in the slots respectively allocated to the CQI. The WTRU does notsupport the case of k′<N_cqi_transmit.

The CQI reporting procedure for the other feedback channel may followthe above described except that the CQI feedback cycle and repetitionfactor parameters may be configured by k₁ and N_cqi_transmit_(—)1. Theabove described may apply to CQI reporting procedure in case the WTRU isconfigured in MIMO mode.

In an embodiment, one set of CQI configuration parameters may be set forthe carriers. CQIs for the two carriers may be repeated in a feedbackchannel. For example, CQI of the first carrier may be repeated inN_cqi_transmit (or N_cqi_transmit_(—)1) consecutive sub-frames followedby repeating the CQI of the second carrier in next N_cqi_transmit (orN_cqi_transmit_(—)1) sub-frames. For example, the CQIs of the first andsecond carriers may be repeated for N_cqi_transmit(orN_cqi_transmit_(—)1) times. For example, the CQI of the first carriermay be repeated for N sub-frames, where N is pre-configured orpre-defined parameter. The CQI for the secondary carrier may be repeatedfor N sub-frames. The repeating may continue until the requiredrepetition factor is reached.

For example, the WTRU may not be configured in MIMO mode. With theexception of the provisions of subclause 6A.3 in 3GPP 25.214 v9.0.0, theCQI/PCI may be reported as follows when the WTRU is not configured inMIMO mode. The WTRU may derive the CQI value for the serving HS-DSCHcell. If Secondary_Cell_Active is 1, the WTRU may derive a CQI value(s)for the secondary serving HS-DSCH cell(s). The CQI report may beconstructed from the CQI value(s). The CQI values from the servingHS-DSCH and secondary serving HS-DSCH cells may be grouped into twosets. Each set may be transmitted through one of two HS-DPCCH feedbackchannels.

In each of feedback channels, for k=0, the WTRU may not transmit the CQIreport. For k>0, when DTX_DRX_STATUS is not TRUE, the WTRU may transmitthe CQI report of the first HS-DSCH cell in each subframe that startsm×256 chips after the start of the associated uplink DPCCH frame with mfulfilling:

(5×CFN+┌m×256chip/7680chip┐)mod k′=0 with k′=k/(2 ms),

where CFN denotes the connection frame number for the associated DPCHand the set of five possible values of m is calculated. For k>0 whenDTX_DRX_STATUS is TRUE, the WTRU may transmit the CQI report of thefirst HS-DSCH based on the CQI transmission pattern. The CQItransmission pattern may be the set of HS-DPCCH subframes whose HS-DPCCHdiscontinuous transmission radio frame number CFN_DRX and subframenumber S_DRX, verify:

((5*CFN_(—) DRX−UE_(—) DTX _(—) DRX_Offset+S _(—) DRX)MOD k′)=0, withk′=k/(2 ms).

The WTRU may repeat the transmission of the CQI report of the firstHS-DSCH cell derived in 1) over the next (N_cqi_transmit−1) consecutiveHS-DPCCH sub frames in the slots respectively allocated to the CQI asdefined in [1]. The WTRU may repeat the transmission of the CQI reportof the second HS-DSCH cell derived in 1) over the next N_cqi_transmitconsecutive HS-DPCCH sub frames in the slots respectively allocated tothe CQI. The WTRU does not support the case of k′<N_cqi_transmit.

The above described may apply to CQI reporting procedure in case theWTRU is configured in MIMO mode.

In an embodiment, the CQI feedback cycle may span more than onesubframe. When the WTRU is configured with the CQI feedback cycleparameter equal to two or greater than two sub-frames (e.g., >=4 ms),the grouped (or paired) CQI may be reported in a time divisionmultiplexing (TDM) fashion. For example, the CQI feedback for eachserving HS-DSCH cell may be encoded individually and transmitted indifferent sub-frames. For example, where the WTRU is not configured inMIMO mode in any of the cells associated and supported by the samefeedback channel, the WTRU may have the two CQI reports encoded jointlyand transmitted together in one sub-frame. The next sub-frame may nottransmit any CQI.

In an embodiment, the CQI reporting slot format may be based on MIMOconfiguration status of the WTRU. For example, if the WTRU is notconfigured in MIMO mode, e.g., none of the configured HS-DSCH cells inthe multiple carrier operation is configured in MIMO mode, CQI reportsfrom the cells may be grouped in pairs. Each pair of CQI reports may bejointly encoded by a (20,10) Reed Muller code. The resulting codewordmay be transmitted in the time slot allocated to the associated feedbackgroup in terms of the CQI feedback cycle and CQI repetition factorparameters configured by the network. When three cells are configured,one pair of CQI reports may be jointly coded and transmitted in the timeslot allocated to a feedback group. The CQI report for the third cellmay be encoded individually with a (20,5) Reed-Muller code, and may betransmitted in a time slot allocated to another feedback group.

If the WTRU is configured in MIMO mode, e.g., when any of the configuredserving HS-DSCH cells in the multiple carrier operation is configured inMIMO mode, CQI/PCI reports for the cells may be encoded individually by(20, 7/10) or (20,5) Reed Muller codes depending on the MIMOconfiguration status of the associated cells. The resulting codewordsmay be grouped in pairs in terms of the cells. The paired codewords maybe transmitted in a TDM fashion in two different (possibly consecutive)sub-frames in the time slots allocated to the associated feedback groupor feedback channel, in terms of the CQI feedback cycle and CQIrepetition factor parameters configured by the network.

FIGS. 44-48 show example HS-DPCCH layouts for various carrierconfigurations. To illustrate, denote C1 as the primary serving HS-DSCHcell, C2, C3, C4 as the first, second, and third secondary servingHS-DCSCH cells, respectively. The examples shown in FIG. 44-48 areimplemented with spreading factor 128. The time slots allocated to thetwo feedback groups may be concatenated with the slot format defined intable 1.

FIG. 44 shows an example of when 4 cells are configured without anybeing configured in MIMO mode. Slot 2 of sub-frame 1 as shown in lightshading may be allocated for the first feedback group. Slot 3 ofsub-frame 1 as shown in dark shading may be allocated for the secondfeedback group. CQI reports for the cells may be jointly encoded. Forexample, the CQI reports for C1 and C2 are jointly encoded by a (20,10)Reed Muller code to form a common codeword. The C1/C2 codeword may betransmitted in slot 2 of sub-frame 1. The CQI reports for C3 and C4 maybe jointly encoded by the same channel coding scheme. The C3/C4 codewordmay be transmitted in slot 3 of in the same sub-frame. In an embodiment,the C3/C4 codeword may be transmitted in slot 3 of sub-frame 2 or inother sub-frames in the time slot allocated to the second feedbackgroup.

FIG. 45 illustrates another example of when 4 cells are configured withthe primary serving cell being configured in MIMO mode. The WTRU may beconsidered in MIMO mode. CQI reports for the cells may be encodedindividually and may be transmitted in a TDM fashion. The CQI report forC1 may include PCI information. The CQI/PCI report for C1 may be encodedby either (20,10) for type A CQI, or (20,7) code for type B CQI. The CQIreports for the rest of cell are encoded by (20,5) code. The resultingcodewords of C1 and C2 may be grouped together and may be transmitted ina TDM manner. For example, codewords of C1 and C2 may be transmittedalternatively in the time slots allocated to the feedback group 1, asmarked in light shading in the figure. The resulting codewords of C3 andC4 may be grouped and may be transmitted alternatively in the time slotsallocated to the feedback group 2, as marked in dark shading in thefigure.

FIG. 46 illustrates an example subframe format when three cells areconfigured and none of the cells is configured in MIMO mode. FIG. 47illustrates an example subframe format when three cells are configuredand the cell is second secondary cell is configured in MIMO mode. FIG.48 illustrates an example subframe format when three cells areconfigured and the three cells are configured in MIMO mode.

In an embodiment, the channel coding for HARQ-ACK may be definedseparately for each group. For example, if the WTRU is not configured inMIMO mode in any of cells in a group, the coding for HARQ-ACK associatedwith the cells that are paired in a group may use the codebook A/N(10)for dual carrier operation. The coding for the HARQ-ACK for the cellthat is one in a group may use the codebook A/N(4) for single carrieroperation. If the WTRU is configured in MIMO mode in any one of thecells in a group then the coding for HARQ-ACK associated with the cellsthat are paired in a group uses the codebook A/N(50) used for dualcarrier MIMO operation; the coding for HARQ-ACK associated with the cellthat is single one in a group may use the codebook A/N(8) used forsingle carrier MIMO operation.

The channel coding for PCI/CQI for each group is performed as follows.If the WTRU is configured in MIMO mode in any one of the cells, then thecoding for the composite PCI/CQI associated with the cell for which theWTRU may use (20,10/7) coding scheme for single carrier MIMO operation;the coding for the CQI associated with the cell for which the WTRU isnot configured in MIMO mode may use (20,5) coding scheme for singlecarrier operation. Otherwise, the coding for CQI associated with thecells that are paired in a group may use (20,10) coding scheme for dualcarrier operation; the coding for CQI for the cell that is one in agroup is specified may use (20, 5) coding scheme for single carrieroperation.

With the exception of the provisions of subclause 6A.3 in 3GPP 25.214v9.0.0, the CQI/PCI may be reported as follows when the WTRU is notconfigured in MIMO mode. The WTRU may derive the CQI value for theserving HS-DSCH cell. If Secondary_Cell_Active is 1, the WTRU may deriveCQI value(s) for the secondary serving HS-DSCH cell(s). The CQI reportis constructed from the CQI value(s).

For k=0, the WTRU may not transmit the CQI report. For k>0 whenDTX_DRX_STATUS is not TRUE, the WTRU may transmit the CQI report in eachsubframe that starts m×256 chips after the start of the associateduplink DPCCH frame with m fulfilling:

(5×CFN+┌m×256chip/7680chip┐)mod k′=0 with k′=k/(2 ms),

where CFN denotes the connection frame number for the associated DPCHand the set of five possible values of m is calculated. For k>0 whenDTX_DRX_STATUS is TRUE, the WTRU may transmit the CQI report based onthe CQI transmission pattern. The CQI transmission pattern is the set ofHS-DPCCH subframes whose HS-DPCCH discontinuous transmission radio framenumber CFN_DRX and subframe number S_DRX, verify:

((5*CFN_(—) DRX−UE_(—) DTX _(—) DRX_Offset+S_DRX)MOD k′)=0, with k′=k/(2ms).

The WTRU may repeat the transmission of the CQI report derived in overthe next (N_cqi_transmit−1) consecutive HS-DPCCH sub frames in the slotsrespectively allocated to the CQI WTRU does not support the case ofk′<N_cqi_transmit. The WTRU may not transmit the CQI in other subframes.

In an embodiment, composite PCI/CQI reporting may be transmitted whenthe WTRU is configured in MIMO mode. With the exception of theprovisions of subclause 6A.3 in 3GPP 25.214 v9.0.0, the CQI/PCI may bereported as follows when the WTRU is not configured in MIMO mode. TheWTRU may derive the PCI value for the serving HS-DSCH cell. Whensingle-stream restriction is not configured, either a type A or a type BCQI value may be reported. When single-stream restriction is configured,type B CQI value for the serving HS-DSCH cell may be reported.

If Secondary_Cell_Active_j is 1, where j may be set to 1, 2, or 3, theWTRU may derive a PCI value for the secondary serving HS-DSCH cell j.When single-stream restriction is not configured, either a type A or atype B CQI value may be reported. When single-stream restriction isconfigured, type B CQI value for the secondary serving HS-DSCH cell jmay be reported.

The WTRU may transmit the composite PCI/CQI value for the servingHS-DSCH cell, and secondary servicing HS_DSCH cell ifSecondary_Cell_Active_(—)2 is 1 as follows. For k=0, the WTRU may nottransmit a composite PCI/CQI value. For k>0 when DTX_DRX_STATUS is notTRUE (see section 6A.1), the WTRU may transmit a composite PCI/CQI valuefor the serving HS-DSCH cell in each subframe that starts m×256 chipsafter the start of the associated uplink DPCCH frame with m fulfilling

(5×CFN+┌m×256chip/7680chip┐)mod k′=0 with k′=k/(2 ms),  (x1)

where CFN denotes the connection frame number for the associated DPCHand the set of five possible values of m is calculated. Whensingle-stream restriction is not configured and the relation

${\left\lfloor \frac{{5 \times C\; F\; N} + \left\lceil {m \times 256\mspace{14mu} {{chip}/7680}\mspace{14mu} {chip}} \right\rceil}{k^{\prime}} \right\rfloor {mod}\; {M\_ cqi}} < {{N\_ cqi}{\_ typeA}}$

holds, the WTRU may report a type A CQI value. Otherwise the WTRU mayreport a type B CQI value.

For k>0 when DTX_DRX_STATUS is TRUE, the WTRU may transmit the CQI valuefor the serving HS-DSCH cell based on the CQI transmission pattern. TheCQI transmission pattern is the set of HS-DPCCH subframes whose HS-DPCCHdiscontinuous transmission radio frame number CFN_DRX and subframenumber S_DRX, verify:

((5*CFN_(—) DRX−UE_(—) DTX _(—) DRX_Offset+S _(—) DRX)mod k′)=0, withk′=k/(2 ms).

When single-stream restriction is not configured and the relation

${\left\lfloor \frac{{5 \times {CFN\_ DRX}} - {{UE\_ DTX}{\_ DRX}{\_ Offset}} + {S\_ DRX}}{k^{\prime}} \right\rfloor {mod}\; {M\_ cqi}} < {{N\_ cqi}{\_ typeA}}$

holds, the WTRU may report a type A CQI value. Otherwise the WTRU mayreport a type B CQI value.

For k>0, the PCI value derived may be transmitted together with the CQIvalue as a composite PCI/CQI value. In case that 2560 is not an integermultiple of M_cqi, the sequence of type A and type B CQI reports mightnot be periodic due to CFN roll-over. The WTRU may repeat thetransmission of the composite PCI/CQI value for the serving HS-DSCH cellderived above over the next (N_cqi_transmit−1) consecutive HS-DPCCH subframes in the slots respectively allocated to CQI. The WTRU may notsupport the case of k′<N_cqi_transmit. The WTRU may not transmitcomposite PCI/CQI for the serving HS-DSCH cell in other subframes.

If Secondary_Cell_Active_(—)1 is 1, the WTRU may transmit the compositePCI/CQI value for the secondary serving HS-DSCH cell 1 over theN_cqi_transmit consecutive HS-DPCCH sub frames immediately following thetransmission for the serving HS-DSCH cell. If Secondary_Cell_Active_(—)3is 1, the WTRU may also transmit the composite PCI/CQI value for thesecondary serving HS-DSCH cell 3 over the N_cqi_transmit consecutiveHS-DPCCH sub frames immediately following the transmission for thesecondary serving HS-DSCH cell 2. If any of Secondary_Cell_Enabled_jamong j=1, 2, 3 is 1, the WTRU may not support the case ofk′<2·N_cqi_transmit.

In an embodiment, the CQI reporting slot format may be based on MIMOconfiguration status of the feedback group. For example, CQI reportsfrom the serving cells configured for the multiple carrier option may befirst paired in feedback groups and CQI reporting format for aparticular group depends on MIMO configuration status of the cells inthat group.

If none of the configured serving HS-DSCH cells in a feedback group isconfigured in MIMO mode, the associated CQI reports may be jointlyencoded by a (20,10) Reed Muller encoder. The resulting codeword may betransmitted in the time slot allocated to the associated feedback groupin terms of the CQI feedback cycle and CQI repetition factor parametersconfigured by the network.

If any of the configured serving HS-DSCH cells in a feedback group isconfigured in MIMO mode, CQI/PCI reports for both cells in the group maybe encoded individually by (20, 7/10) or (20,5) Reed Muller codesdepending on the MIMO configuration status of the associated cells. Theresulting codewords may be transmitted in a TDM fashion in two different(e.g. consecutive) sub-frames in the time slots allocated to theassociated feedback group, in terms of the CQI feedback cycle and CQIrepetition factor parameters configured by the network.

When three cells are configured, the CQI report for the cell that is notgrouped may be encoded individually with a (20,5) or (20,10/7)Reed-Muller code and may be transmitted in a time slot allocated toanother feedback group solely for this cell.

FIGS. 49-51 shows example HS-DPCCH layouts. The example layouts mayapply to cases where the spreading factor is set to 128. Two time slotsmay be available in a sub-frame to carrier the CQI reports for twofeedback groups.

FIG. 49 illustrates an example subframe format when four cells areconfigured and the primary cell is configured in MIMO mode. As shown,CQI for one feedback group may be transmitted in TDM, and the otherfeedback group may be jointly encoded.

FIG. 50 illustrates an example subframe format when four cells areconfigured and the primary cell and the second secondary cell areconfigured in MIMO mode. For example, both feedback groups may includecells with MIMO configured. The CQI reports may be individually encodedand transmitted in TDM.

FIG. 51 illustrates an example subframe format when three cells areconfigured and the second secondary cell is configured in MIMO mode.

In an embodiment, the CQI reporting format may not depend on any MIMOconfiguration status of the cells. For example, CQI/PCI reports for thecells may be encoded individually by (20, 7/10) or (20,5) Reed Mullercodes depending on the MIMO configuration status of the associatedcells. The coded CQI/PCI reports may be paired in feedback groups. Thetwo codewords in a group may be transmitted in a TDM fashion in the timeslots allocated for the associated group in different sub-frames. Forexample, the two codewords may be transmitted in consecutive sub-frames.

In case three cells are configured, the CQI report for the cell that isnot grouped may be encoded individually with a (20,5) or (20,10/7)Reed-Muller code and transmitted in a time slot allocated to a feedbackgroup solely for this cell.

FIGS. 49-51 illustrate example HS-DPCCH layouts. Examples illustrated inFIGS. 52-54 may apply to cases where the spreading factor is 128. Twofeedback groups can be mapped in the two slots in a sub-frame for CQItransmission. FIG. 52 illustrates an example subframe format when fourcells are configured and the primary cell is configured in MIMO mode.FIG. 53 illustrates an example subframe format when four cells areconfigured and the primary cell and the second secondary cells areconfigured in MIMO mode. FIG. 54 illustrates an example subframe formatwhen three cells are configured and the second secondary cell isconfigured in MIMO mode.

The examples described above are provided for illustration purposes andtherefore are not intended to cover an exhaustive list of all possiblecombinations resulting from different carrier configurations, and forwhich it is assumed that the related CQI reporting formats arecontemplated.

In an embodiment, the feedback reporting may be transmitted during acompressed mode gap. Compressed mode gaps may be used to provideopportunities for measurement (for both uplink and downlink). On theuplink, compressed mode gaps may be defined by the network such that theWTRU may make inter-frequency measurements. During a compressed modegap, the WTRU may retune the radio frequency (RF) circuit to listen andmeasure on a different frequency.

In an embodiment, the WTRU may not transmit (DTX) the first slot of theHS-DPCCH (slot carrying the HARQ-ACK) when it overlaps with an uplinktransmission gap. When part of the 2 slots allocated to CQI field in theHS-DPCCH overlaps with a compressed mode gap, the WTRU may not transmitthe CQI (or composite PCI/CQI information on that subframe).

During compressed mode on the associated DPCH or F-DPCH, the followingapplies for the WTRU for transmission of HS-DPCCH and/or reception ofHS-SCCH and HS-PDSCH. If a part of a HS-DPCCH slot allocated to HARQ-ACKoverlaps with an uplink transmission gap on the associated DPCH, theWTRU may use DTX on the HS-DPCCH in that HS-DPCCH slot. If in a HS-DPCCHsub-frame a part of the slots allocated for CQI information overlapswith an uplink transmission gap on the associated DPCH, the WTRU may nottransmit CQI or composite PCI/CQI information in that sub-frame.

FIG. 55 illustrates example HS-DPCCH structure. For example, the CQI orcomposite PCI/CQI for each feedback channel may be carried in one slot(e.g., in CQI A or CQI B). In an embodiment, during a compressed modegap, if part of the uplink gap overlaps part of the slot that carries asingle PCI/CQI information report on the HS-DPCCH, the HS-DPCCH overthat time slot may not be transmitted (e.g. DTXed). Part of the CQIfeedback field may be DTXed when the PCI/CQI is self contained in oneslot of the HS-DPCCH. In an embodiment, when there is repetition of thePCI/CQI in the adjacent slot, as the power setting of the CQI field maybe adjusted to ensure reliability assuming repetition.

For example, during compressed mode on the associated DPCH or F-DPCH,the following may apply for the WTRU for transmission of HS-DPCCH andreception of HS-SCCH and HS-PDSCH. If the WTRU is configured with lessthan 2 secondary serving HS-DSCH cells and if in a HS-DPCCH sub-frame apart of the slots allocated for CQI information overlaps with an uplinktransmission gap on the associated DPCH, the WTRU may not transmit CQIor composite PCI/CQI information in that sub-frame. If the WTRU isconfigured with 2 or more secondary serving HS-DSCH cells and if in aHS-DPCCH sub-frame a part of a slot allocated for CQI informationoverlaps with an uplink transmission gap on the associated DPCH, theWTRU may not transmit carrying CQI or composite PCI/CQI information inthat slot.

In an embodiment, the condition may be linked to carrier activation.During compressed mode on the associated DPCH or F-DPCH, the followingmay apply for the WTRU for transmission of HS-DPCCH and reception ofHS-SCCH and HS-PDSCH. If the WTRU has less than 2 secondary servingHS-DSCH cells activated and if in a HS-DPCCH sub-frame a part of theslots allocated for CQI information overlaps with an uplink transmissiongap on the associated DPCH, the WTRU may not transmit CQI or compositePCI/CQI information in that sub-frame. If the WTRU has 2 or moresecondary serving HS-DSCH cells activated and if in a HS-DPCCH sub-framea part of a slot allocated for CQI information overlaps with an uplinktransmission gap on the associated DPCH, the WTRU may not transmitcarrying CQI or composite PCI/CQI information in that slot.

In an embodiment, the PCI/CQI information may be transmitted during thetwo slots relates to different downlink cells. In the case where theWTRU is repeating the PCI/CQI, the entire PCI/CQI field (e.g. the lasttwo slots of the HS-DPCCH frame format) may be DTXed. This may allow thePCI/CQI to be received with sufficient reliability at the NodeB. Forexample, during compressed mode on the associated DPCH or F-DPCH, thefollowing applies for the WTRU for transmission of HS-DPCCH andreception of HS-SCCH and HS-PDSCH. If the WTRU has less than 2 secondaryserving HS-DSCH cells activated and if in a HS-DPCCH sub-frame a part ofthe slots allocated for CQI information overlaps with an uplinktransmission gap on the associated DPCH, the WTRU may not transmit CQIor composite PCI/CQI information in that sub-frame. If the WTRU has twoor more secondary serving HS-DSCH cells activated and if in a HS-DPCCHsub-frame a part of a slot allocated for CQI information overlaps withan uplink transmission gap on the associated DPCH, the WTRU may nottransmit carrying CQI or composite PCI/CQI information in that slot.

In an embodiment, when the WTRU is configured with 4 carriers, or whenit is configured with 3 carriers with at least one carrier beingconfigured in MIMO mode, the WTRU may transmit CQI individually in eachslot of the HS-DPCCH CQI field. During compressed mode on the associatedDPCH or F-DPCH, the following may applies for the WTRU for transmissionof HS-DPCCH and reception of HS-SCCH and HS-PDSCH. If a part of aHS-DPCCH slot allocated to HARQ-ACK overlaps with an uplink transmissiongap on the associated DPCH, the WTRU may use DTX on the HS-DPCCH in thatHS-DPCCH slot. If in a HS-DPCCH sub-frame a part of the slots allocatedfor CQI information overlaps with an uplink transmission gap on theassociated DPCH, then if Secondary_Cell_Enable is 3 orSecondary_Cell_Enable is 2 and at least one cell is configured in MIMOmode, and Secondary_Cell_Active is 2 or 3, the WTRU may not transmit CQIor composite PCI/CQI in that slot, otherwise the WTRU may not transmitCQI or composite PCI/CQI information in that sub-frame.

During compressed mode on the associated DPCH or F-DPCH, the followingmay apply for the WTRU for transmission of HS-DPCCH and reception ofHS-SCCH and HS-PDSCH. If a part of a HS-DPCCH slot allocated to HARQ-ACKoverlaps with an uplink transmission gap on the associated DPCH, theWTRU may use DTX on the HS-DPCCH in that HS-DPCCH slot.

If in an HS-DPCCH sub-frame, a part of the slots allocated for CQIinformation overlaps with an uplink transmission gap on the associatedDPCH, if the WTRU uses HS-DPCCH slot format 1, and Secondary_Cell_Activeis 2 or 3, the WTRU may not transmit CQI or composite PCI/CQI in thatslot. Otherwise, the WTRU may not transmit CQI or composite PCI/CQIinformation in that sub-frame.

When PRE/POST codewords are enabled by the network withHARQ_preamble_mode=1, the Node B may not distinguish ACK/NACKs from DTX(i.e., no transmission of any signals) for the sub-frames after PRE andbefore POST. The use of the PRE/POST may improve the ACK/NACK detectionperformance.

In an embodiment, at sub-frame n, if the information received on HS-SCCHis not discarded, the WTRU may transmit PRE at sub-frame n−1, unless anACK or NACK or any combination of ACK and NACK is to be transmitted insub-frame n−1. If ACK or NACK or any combination of ACK and NACK istransmitted in sub-frame n, and N_acknack_transmit=1, the WTRU maytransmit a POST in sub-frame n+1 unless ACK or NACK or PRE or anycombination of ACK and NACK is to be transmitted in this subframe. IfACK or NACK or any combination of ACK and NACK is transmitted insub-frame n, and N_acknack_transmit>1, the WTRU may transmit a POST insub-frame n+2×N_acknack_transmit−2 unless ACK or NACK or PRE or anycombination of ACK and NACK is to be transmitted in this sub-frame.

In MC-HSDPA, two feedback channels (or two HARQ-ACK messages) may beintroduced in one HARQ-ACK slot in a sub-frame to accommodate the needto carry more ACK/NACK information. A DTX codeword, named DCW, may beincluded in the codebook to avoid half slot transmissions. The true DTXthat may transmit no signal in the HARQ-ACK slot, may occur if DTX isreported on both HARQ-ACK message. If one HARQ-ACK message is carryingthe DTX state information for the cells support in that feedbackchannel, the DTX codeword DCW may be sent such that no transmission ofsignals in the assigned half slot may be avoided.

There may be two parameters that may be related to the PRE/POSTtransmission, such as HARQ_preamble_mode and N_acknack_transmit. WhenHARQ_preamble_mode is set to 1 by the network, the WTRU may enter into amode that allow PRE/POST being transmitted to optimize the ACK/NACKdetection performance. N_acknack_transmit may be a parameter that maycontrol the number of sub-frames over which the ACK/NACK messages may berepeated.

In an embodiment, common parameter setting may be used for the cells.Foe example, one set of the above parameters may be configured by thenetwork and all the cells may follow the same settings. The repetitionof ACK/NACK information according to N_acknack_transmit may start at thesame time (e.g., in the same sub-frame) for both of HARQ-ACK messages. Anumber of sub-frames may be offset when starting the repetition fordifferent HARQ-ACK messages, or for difference cells.

In an example embodiment, N_acknack_transmit may be configured per pairof cells that are supported in the same feedback channel (or HARQ-ACKmessage), or it may be configured per cell. This may provide differentlevel of protection on the ACK/NACK transmission.

In an embodiment, transmission of PRE or POST in a feedback channel maybe independent from the other feedback channel and may be determinedbased on the content of the HARQ ACK message sent on this feedbackchannel across the neighbouring sub-frames. The related rules may bedefined as follows.

At sub-frame n, if the information received on HS-SCCH for the cell orthe pair of cells that are supported by the same feedback channel is notdiscarded, the WTRU may transmit PRE on this feedback channel atsub-frame n−1, unless an ACK or NACK or any combination of ACK and NACKis to be transmitted in this feedback channel in sub-frame n−1.

If ACK or NACK or any combination of ACK and NACK is transmitted for thecell or the pair of cells that are supported by the same feedbackchannel in sub-frame n, and N_acknack_transmit=1, the WTRU may transmita POST on this feedback channel in sub-frame n+1 unless ACK or NACK orPRE or any combination of ACK and NACK is to be transmitted on thisfeedback channel in this sub-frame.

If ACK or NACK or any combination of ACK and NACK is transmitted for thecell or the pair of cells that are supported by the same feedbackchannel in sub-frame n, and N_acknack_transmit>1, the WTRU may transmita POST on this feedback channel in sub-frame n+2×N_acknack_transmit−2unless ACK or NACK or PRE or any combination of ACK and NACK is to betransmitted on this feedback channel in this sub-frame.

FIG. 56 shows example ACK/NACK information to be reported, and FIG. 57shows an actual transmitted signal for the example. FIG. 56 illustratesa set of ACK/NACK information that the WTRU may convey to the Node Bover a series of sub-frames. The actual transmitted signal is generatedin FIG. 57. From the multiple PREs and POST, the Node B may determineover which sub-frames detection of true DTX is not required. As shown inFIG. 57, detection of true DTX may not be required from sub-frame n ton+4.

FIG. 58 shows another example of ACK/NACK information to be reported,and FIG. 59 shows an actual transmitted signal for this example. FIG. 58illustrates a set of ACK/NACK information that the WTRU may convey tothe Node B over a series of sub-frames. The Node B may make a judgmentover which sub-frames of the detection of true DTX can be avoided.

In an embodiment, the transmission of PRE or POST may be determinedjointly according to the ACK/NACK information on the feedback channelsacross the neighbouring sub-frames. In an embodiment, the transmissionof PRE or POST may be determined jointly according to the ACK/NACKinformation for active cells. The PRE or POST may be transmittedsimultaneously on both of the HARQ-ACK messages in the HARQ-ACK slot ofthe same sub-frame.

At sub-frame n, if the information received on HS-SCCH from any cell isnot discarded, the WTRU may transmit PRE on the HARQ-ACK messages atsub-frame n−1, unless an ACK or NACK or any combination of ACK and NACKis to be transmitted for any cell in sub-frame n−1.

If ACK or NACK or any combination of ACK and NACK is transmitted for anycell in sub-frame n, the WTRU may transmit a POST on all HARQ-ACKmessages in sub-frame n+2×N_acknack_transmit−1 unless ACK or NACK or PREor any combination of ACK and NACK is to be transmitted for any cell inthis sub-frame.

If ACK or NACK or any combination of ACK and NACK is transmitted for anycell in sub-frame n, and N_acknack_transmit>1, the WTRU may transmit aPOST on all HARQ-ACK messages in sub-frame n+2×N_acknack_transmit−2unless ACK or NACK or PRE or any combination of ACK and NACK is to betransmitted for any cell in this sub-frame.

FIG. 60 illustrates the actual transmitted signal with PREs/POSTs beingfilled for the example described in FIG. 58.

FIG. 61 shows transmit PRE/POST on the first HARQ-ACK message. ThePRE/POST may be restricted to transmit on the 1st or 2nd half slot,which may carry the ACK/NACK information for the primary cell. ThePRE/POST may be restricted to transmit on the 1st HARQ-ACK message. Onthe other half slot, DCW may be transmitted.

In an embodiment, codebook may be optimized. For example, the size ofthe codebook may be reduced such that the amount of feedback associatedto multi-carrier operations may be reduced. For example, the size of thecodebook may be reduced by associating the same feedback codeword tomany different events. Through many-to-one mapping, the receiver, suchas a base station in this case, may not be capable of distinguishingbetween the events. The impact of this ambiguity may be minimal when theproper set of restrictions or groupings are used.

Table 44A shows example combinations of HARQ-ACK states for 3 carrierswithout MIMO. In an initial design without optimization, simultaneoustransmission over 3 carriers would result in a total number of HARQ-ACKstates in the codebook equal to 3³−1=26, as listed in Table 44A.

TABLE 44A A/D/D/ A/N/D/ N/A/D/ D/D/A/ D/N/A/ A/D/A/ A/N/A/ N/A/A/ D/D/N/D/N/N/ A/D/N/ A/N/N/ N/A/N/ D/A/D/ A/A/D/ N/D/D/ N/N/D/ D/A/A/ A/A/A/N/D/A/ N/N/A/ D/A/N/ A/A/N/ N/D/N/ N/N/N/ D/N/D/

In an embodiment, carrier DTX restriction may be applied to optimizecodebook. For example, the discontinuous transmission operation on onespecific carrier may be not allowed unless the other configured carriersare also in the DTX state. For example, an anchor carrier may be chosenas this specific carrier over which the data transmission is scheduledwith higher priority if there is any. If the WTRU fails to detect theHS-SCCH on this carrier while it succeeds on any of the other carriers,the WTRU may map DTX to NACK in its feedback for this carrier, knowingthat it is not DTX'd in fact.

An example optimized set of the reported HARQ-ACK states is shown inTable 44B. For example, the total number of states may be reduced from26 to 18.

TABLE 44B A/D/D/ A/N/D/ N/A/D/ A/D/A/ A/N/A/ N/A/A/ A/D/N/ A/N/N/ N/A/N/A/A/D/ N/D/D/ N/N/D/ A/A/A/ N/D/A/ N/N/A/ A/A/N/ N/D/N/ N/N/N/

Table 49 shows example optimized set of the reported HARQ-ACK states for4 non-MIMO carrier. The original codebook size before the optimizationis 80. Upon applying carrier DTX restriction optimization, the effectivesize may be reduced to 54, as shown in Table 49.

TABLE 49 A/D/D/D A/A/D/A A/N/D/N N/D/A/D N/A/A/A N/N/A/N A/D/D/A A/A/D/NA/N/A/D N/D/A/A N/A/A/N N/N/N/D A/D/D/N A/A/A/D A/N/A/A N/D/A/N N/A/N/DN/N/N/A A/D/A/D A/A/A/A A/N/A/N N/D/N/D N/A/N/A N/N/N/N A/D/A/A A/A/A/NA/N/N/D N/D/N/A N/A/N/N A/D/A/N A/A/N/D A/N/N/A N/D/N/N N/N/D/D A/D/N/DA/A/N/A A/N/N/N N/A/D/D N/N/D/A A/D/N/A A/A/N/N N/D/D/D N/A/D/A N/N/D/NA/D/N/N A/N/D/D N/D/D/A N/A/D/N N/N/A/D A/A/D/D A/N/D/A N/D/D/N N/A/A/DN/N/A/A

In an embodiment, ordered DTX restriction may be applied to optimizecodebook. For example, the configured carriers may be arranged in aspecific order. When the network decides to DTX some carriers fordownlink data transmission, it may sequentially select the low (or high)rank ones first. Some carriers may be known to transmit by the WTRU asimplied or reasoned from the DTX status of the low (or high) rankedcarriers. If the WTRU fails to detect HS-SCCH on these carriers, TheWTRU may replace DTX by NACK in the feedback for these carriers, knowingthey are not in fact DTX'd.

Table 44C shows example optimized set of HARQ-ACK states for 3 carrierswithout MIMO. The resulting table of the reported HARQ-ACK states isshown in Table 44C, which has a size of 15.

TABLE 44C D/D/D/ A/N/D/ N/A/A/ A/D/D/ A/N/A/ N/A/N/ A/A/D/ A/N/N/ N/N/D/A/A/A/ N/D/D/ N/N/A/ A/A/N/ N/A/D/ N/N/N/

Table 50 shows an example optimized set of HARQ-ACK states for 4carriers without MIMO. Upon applying ordered DTX restrictionoptimization, the codebook size may be reduced to 30, as shown in Table50.

TABLE 50 A/D/D/D A/N/A/A N/A/N/D A/A/D/D A/N/A/N N/A/N/A A/A/A/D A/N/N/DN/A/N/N A/A/A/A A/N/N/A N/N/D/D A/A/A/N A/N/N/N N/N/A/D A/A/N/D N/D/D/DN/N/A/A A/A/N/A N/A/D/D N/N/A/N A/A/N/N N/A/A/D N/N/N/D A/N/D/D N/A/A/AN/N/N/A A/N/A/D N/A/A/N N/N/N/N

In an embodiment, the reported HARQ-ACK states may be directly encodedby the 10 bit binary codewords as specified in Table 45. In Table 45,each row of the binary numbers represents a codeword that is labeledfrom c1 to c26. For example, the HARQ-ACK states described in Table 44Amay be mapped to the binary codewords in Table 45 in a combination. Anexample mapping is shown in Table 46. The mapping may maintain backwardcompatibility with the 3GPP WCDMA Release 8 standard as c1 to c8actually are purposely arranged to be identical to the legacy codebookin the standard.

TABLE 45 codeword name binary codewords c1 1 1 1 1 1 1 1 1 1 1 c2 0 0 00 0 0 0 0 0 0 c3 1 1 1 1 1 0 0 0 0 0 c4 0 0 0 0 0 1 1 1 1 1 c5 1 0 1 0 10 1 0 1 0 c6 1 1 0 0 1 1 0 0 1 1 c7 0 0 1 1 0 0 1 1 0 0 c8 0 1 0 1 0 1 01 0 1 c9 1 0 1 0 0 1 0 0 0 1 c10 0 1 1 0 1 1 0 1 1 0 c11 1 0 1 1 0 1 0 11 0 c12 0 0 0 1 1 1 0 0 1 0 c13 0 0 1 1 1 1 1 0 0 1 c14 1 0 0 1 1 0 1 10 1 c15 1 0 0 1 0 0 0 0 1 1 c16 0 1 1 1 0 1 1 0 1 0 c17 1 1 0 0 0 0 0 11 0 c18 0 1 1 0 1 0 1 1 0 1 c19 1 0 0 1 0 1 1 0 0 0 c20 0 1 0 1 1 0 1 11 0 c21 1 0 0 0 1 1 0 1 0 0 c22 1 1 1 0 0 1 1 1 0 0 c23 0 1 1 0 0 0 0 01 1 c24 0 1 0 0 1 1 1 0 0 0 c25 1 1 0 0 0 0 1 0 0 1 c26 0 0 1 1 1 0 0 11 1

TABLE 46 codeword name HARQ-ACK states c1 A/D/D c2 N/D/D c3 D/A/D c4D/N/D c5 A/A/D c6 A/N/D c7 N/A/D c8 N/N/D c9 D/D/A c10 D/D/N c11 A/D/Ac12 A/D/N c13 N/D/A c14 N/D/N c15 D/A/A c16 D/A/N c17 D/N/A c18 D/N/Nc19 A/A/A c20 A/A/N c21 A/N/A c22 A/N/N c23 N/A/A c24 N/A/N c25 N/N/Ac26 N/N/N

Table 47 shows the design of a complete HARQ-ACK codebook with binarycodeword mapping for PRE and POST states.

TABLE 47 HARQ-ACT states codewords A/D/D 1 1 1 1 1 1 1 1 1 1 N/D/D 0 0 00 0 0 0 0 0 0 D/A/D 1 1 1 1 1 0 0 0 0 0 D/N/D 0 0 0 0 0 1 1 1 1 1 A/A/D1 0 1 0 1 0 1 0 1 0 A/N/D 1 1 0 0 1 1 0 0 1 1 N/A/D 0 0 1 1 0 0 1 1 0 0N/N/D 0 1 0 1 0 1 0 1 0 1 D/D/A 1 0 1 0 0 1 0 0 0 1 D/D/N 0 1 1 0 1 1 01 1 0 A/D/A 1 0 1 1 0 1 0 1 1 0 A/D/N 0 0 0 1 1 1 0 0 1 0 N/D/A 0 0 1 11 1 1 0 0 1 N/D/N 1 0 0 1 1 0 1 1 0 1 D/A/A 1 0 0 1 0 0 0 0 1 1 D/A/N 01 1 1 0 1 1 0 1 0 D/N/A 1 1 0 0 0 0 0 1 1 0 D/N/N 0 1 1 0 1 0 1 1 0 1A/A/A 1 0 0 1 0 1 1 0 0 0 A/A/N 0 1 0 1 1 0 1 1 1 0 A/N/A 1 0 0 0 1 1 01 0 0 A/N/N 1 1 1 0 0 1 1 1 0 0 N/A/A 0 1 1 0 0 0 0 0 1 1 N/A/N 0 1 0 01 1 1 0 0 0 N/N/A 1 1 0 0 0 0 1 0 0 1 N/N/N 0 0 1 1 1 0 0 1 1 1 PRE 0 01 0 0 1 0 0 1 0 POST 0 1 0 0 1 0 0 1 0 0

In an embodiment, per-state DTX restriction may be applied to optimizecodebook. A set of specific carrier DTX states that may be related tothe combinations of DTX status of the configured carriers may bedefined. One or more of the states in the set may be restricted not tooccur in the network scheduling. If a combination in the set is detectedat UE because of the misdetection of HS-SCCH in some carriers, the UEmay replace DTX by NACK in a feedback for these carriers, knowing theyare not in fact DTXed.

In an embodiment, the carrier DTX restriction optimization may be usedin conjunction with per-state DTX restriction optimization. Table 51shows an example optimized set of HARQ-ACK states for 4 carriers withoutMIMO. As shown in Table 51, the HARQ-ACK states marked with dots andcross-hatch may be eliminated from the original table. This approach maytake advantage of the encoding schemes for dual carrier operation incombination with MIMO as specified in Release 9, by having a table sizeof the reported HARQ-ACK states of 48 or smaller, excluding PRE/POSTstates. The states marked with cross-hatch may be obtained from therestricted DTX state, TX/DTX/TX/TX. For example, the second carrier maybe DTXed when the other 3 carriers are transmitting. The states markedwith dots obtained using carrier DTX restriction optimization.

TABLE 51

A/A/A/N A/N/N/D

N/A/N/N

A/A/N/D A/N/N/A

N/N/D/D

A/D/N/D A/A/N/A A/N/N/N N/A/D/D N/N/D/A

A/A/N/N N/D/D/D N/A/D/A N/N/D/N

A/N/D/D N/D/D/A N/A/D/N N/N/A/D

A/A/D/D A/N/D/A N/D/D/N N/A/A/D N/N/A/A

A/D/D/D A/A/D/A A/N/D/N N/D/A/D N/A/A/A N/N/A/N

A/D/D/A A/A/D/N A/N/A/D

N/A/A/N N/N/N/D

A/D/D/N A/A/A/D A/N/A/A

N/A/N/D N/N/N/A

A/D/A/D A/A/A/A A/N/A/N N/D/N/D N/A/N/A N/N/N/N

The design cases described below are exemplary and are not meant toprovide an exhaustive list of all the combinations.

For example, a reduced spread factor of 128 may be used for HS-DPCCHchannel such that the number of data bits per HS-DPCCH slot may doubledcompared to dual-carrier HSDPA system with a spreading factor of 256. Asecondary carrier may be deactivated when four carriers are configured,and HS-DPCCH may use spread factor of 128. Whether the carrier isconfigured in multiple input multiple output (MIMO) or non-MIMO mode andthe number of non-MIMO carriers may impact HS-DPCCH channel codingdesign.

For example, this may result in unused one slot or one subslot withineach HS-DPCCH subframe. In an embodiment, repetition coding may beperformed such that vacant slots may be used. FIG. 62 shows an exampleencoding process. As shown in FIG. 62, the same information bits may gothrough two same encoders, one for slot i, the other for slot i+1.However, investigating more efficient solutions than the simple coderepetition, without significantly increasing decoding complexity isdesirable.

FIG. 63 shows an example encoding process. As shown, before applying theencoder on slot i+1, a mapper may map the information bits in a way suchthat the obtained coded bits for slot i+1, in combination with the codedbits for slot i, may meet a certain criteria. For example, theinformation bit may be mapped such that the optimal decoding performancemay be achieved. The encoder on slot i+1 may be the same as the encoderused for slot i.

FIG. 64 illustrates an example coding scheme when the encoder is a (m,n)block code. As the two (m,n) block coding in FIG. 63 may be treated as asingle (2m,n) block coding, one design criteria for the mapper may bemaximization of the minimum codeword distance of the (2m,n) block code.

FIG. 65 illustrates example to HS-DPCCH layout. As a result of the 4millisecond (ms) minimum CQI feedback cycle, as shown in FIG. 65, CQImay be encoded. For example, joint cell CQI encoding and repeat (singleDual Cell (DC) CQI coding with repetition) may be implemented. Forexample, independent CQI encoding for each cell (dual Single Cell (SC)CQI coding) may be implemented.

FIG. 66 illustrates an example coding scheme. For example, a scrambler,one type of the mapper, is used in this implementation.

FIG. 67 illustrates an example coding scheme. For example, aninterleaver may used to map the 10-bit information before applying the(20,10) block code.

FIG. 68 shows the performance gain of this scheme over repetitioncoding. Using computer search, an interleaver [10 9 8 5 3 7 6 2 1 4](e.g., with input [s1 s2 s3 s4 s5 s6 s7 s8 s9 s10], the interleaveroutput may be [s10 s9 s8 s5 s3 s7 s6 s2 s1 s4]) maximizing the minimumweight of the (40,10) codeword may be used in the simulations.

Although features and elements are described above in particularcombinations, one of ordinary skill in the art will appreciate that eachfeature or element can be used alone or in any combination with theother features and elements. In addition, the methods described hereinmay be implemented in a computer program, software, or firmwareincorporated in a computer-readable medium for execution by a computeror processor. Examples of computer-readable media include electronicsignals (transmitted over wired or wireless connections) andcomputer-readable storage media. Examples of computer-readable storagemedia include, but are not limited to, a read only memory (ROM), arandom access memory (RAM), a register, cache memory, semiconductormemory devices, magnetic media such as internal hard disks and removabledisks, magneto-optical media, and optical media such as CD-ROM disks,and digital versatile disks (DVDs). A processor in association withsoftware may be used to implement a radio frequency transceiver for usein a WTRU, UE, terminal, base station, RNC, or any host computer.

What is claimed:
 1. A wireless transmit/receive unit (WTRU) for sendinguplink feedback information for a plurality of serving cells via a highspeed dedicated physical control channel (HS-DPCCH), wherein theplurality of serving cells comprises at least one active serving cell,the WTRU comprising: a processor configured to: determine that at leastone secondary serving cell is deactivated; encode uplink feedbackinformation for the at least one active serving cell; and repeat theencoded uplink feedback information for the at least one active servingcell in an HS-DPCCH sub-frame.
 2. The WTRU of claim 1, wherein the atleast one active serving cell comprises a primary serving cell and anactive secondary serving cell, and the uplink feedback informationcomprises hybrid automatic repeat request (HARQ) information.
 3. TheWTRU of claim 2, wherein the encoding of the uplink feedback informationcomprises jointly encoding HARQ information for the primary serving celland HARQ information for the active secondary serving cell to formjointly-coded HARQ information.
 4. The WTRU of claim 3, wherein therepeating of the encoded uplink feedback information comprises repeatingthe jointly-coded HARQ information to fill a time slot allocated forHARQ feedback transmission in the HS-DPCCH sub-frame.
 5. The WTRU ofclaim 1, wherein the plurality of serving cells comprises a primaryserving cell and three or more enabled secondary serving cells, the atleast one deactivated secondary serving cell comprises at least twodeactivated secondary serving cells, and the uplink feedback informationcomprises channel quality indicator (CQI) information.
 6. The WTRU ofclaim 5, wherein the repeating of the encoded uplink feedbackinformation comprises repeating CQI information for the at least oneactive serving cell to fill two time slots allocated for CQI/precodingcontrol indication (PCI) feedback transmission in the HS-DPCCHsub-frame.
 7. The WTRU of claim 1, wherein the plurality of servingcells comprises a plurality of active serving cells, and the encoding ofthe uplink feedback information comprises independently encoding CQIinformation for each of the plurality of serving cells.
 8. The WTRU ofclaim 1, wherein the uplink feedback information comprises channelquality indicator (CQI) information, and when the plurality of servingcells comprises a primary serving cell and two enabled secondary servingcells, and multiple-input and multiple-output (MIMO) is configured in atleast one serving cell, the repeating of the encoded uplink feedbackinformation comprises repeating CQI information for each of the at leastone active serving cell to fill a plurality of time slots allocated forCQI feedback transmission in the HS-DPCCH sub-frame.
 9. The WTRU ofclaim 1, wherein a slot format having a spreading factor of 128 is usedto send the uplink feedback information.
 10. The WTRU of claim 1,wherein the at least one active serving cell comprises two activesecondary serving cells, MIMO is configured in at least one servingcell, the uplink feedback information comprises hybrid automatic repeatrequest (HARQ) information, and the processor is configured to send theHARQ information using a quantized amplitude ratio translated from amaximum value between a signaled value ΔACK+2 and a signaled valueΔNACK+2 when the HARQ information comprises at least one of both ACK andNACK, a PRE, or a POST.
 11. A method for sending uplink feedbackinformation for a plurality of serving cells via a high speed dedicatedphysical control channel (HS-DPCCH), wherein the plurality of servingcells comprises at least one active serving cell, the method comprising:determining that at least one secondary serving cell is deactivated;encoding uplink feedback information for the at least one active servingcell; and repeating the encoded uplink feedback information for the atleast one active serving cell in an HS-DPCCH sub-frame.
 12. The methodof claim 11, wherein the at least one active serving cell comprises aprimary serving cell and an active secondary serving cell, and theuplink feedback information comprises hybrid automatic repeat request(HARQ) information.
 13. The method of claim 12, wherein the encoding ofthe uplink feedback information comprising jointly encoding HARQinformation for the primary serving cell and HARQ information for theactive secondary serving cell to form jointly-coded HARQ information.14. The method of claim 13, wherein the repeating of the encoded uplinkfeedback information comprising repeating the jointly-coded HARQinformation to fill a time slot allocated for HARQ feedback transmissionin the HS-DPCCH sub-frame.
 15. The method of claim 11, wherein theplurality of serving cells comprises a primary serving cell and three ormore enabled secondary serving cells, the at least one deactivatedsecondary serving cell comprises at least two deactivated secondaryserving cells, and the uplink feedback information comprises channelquality indicator (CQI) information.
 16. The method of claim 14, whereinthe repeating of the encoded uplink feedback information comprisingrepeating CQI information for the at least one active serving cell tofill two time slots allocated for CQI/precoding control indication (PCI)feedback transmission in the HS-DPCCH sub-frame.
 17. The method of claim11, wherein the plurality of serving cells comprises a plurality ofactive serving cells, and the encoding of the uplink feedbackinformation comprising independently encoding CQI information for eachof the plurality of serving cells.
 18. The method of claim 11, whereinthe uplink feedback information comprises channel quality indicator(CQI) information, and when the plurality of serving cells comprises aprimary serving cell, and two enabled secondary serving cells andmultiple-input and multiple-output (MIMO) is configured in at least oneserving cell, the repeating of the encoded uplink feedback informationcomprising repeating channel quality indicator (CQI) information foreach of the at least one active serving cell to fill a plurality of timeslots allocated for CQI feedback transmission in the HS-DPCCH sub-frame.19. The method of claim 11, wherein a slot format having a spreadingfactor of 128 is used to send the uplink feedback information.
 20. Themethod of claim 11, wherein the at least one active serving cellcomprises two active secondary serving cells, MIMO is configured in atleast one serving cell, the uplink feedback information comprises hybridautomatic repeat request (HARQ) information, and the method comprises:sending the HARQ information using a quantized amplitude ratiotranslated from a maximum value between a signaled value ΔACK+2 and asignaled value ΔNACK+2 when the HARQ information comprises at least oneof both ACK and NACK, a PRE, or a POST.